## OPEN CASCADE CAD Assistant
List of Open Source components
Version 1.0, 26 May 2016.

OPEN CASCADE CAD Assistant Software uses the following Open Source Components.

The version of each library used in particular version of CAD Assistant can be checked in About / License menu.

Contents

1 Open CASCADE Technology

2 Qt

3 FreeType

4 FreeImage

5 RPly

6 WinSparkle

7 RapidJSON

8 GNU C++ run-time

9 Bullet

10 openNURBS

11 Open Asset Import Library

12 OpenVR Library

### 1 Open CASCADE Technology

Open CASCADE Technology (OCCT) is an object-oriented C++ class library designed for rapid production of sophisticated domain-specific CAD/CAM/CAE applications.

Web site: https://dev.opencascade.org/

Open CASCADE Technology is used under the GNU Lesser General Public License (LGPL) version 2.1 with additional exception.

Text of the license and exception follows.

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    That's all there is to it!

OPEN CASCADE EXCEPTION (VERSION 1.0) TO GNU LGPL VERSION 2.1.

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### 2 Qt

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    permission, would make you directly or secondarily liable for
    infringement under applicable copyright law, except executing it on a
    computer or modifying a private copy.  Propagation includes copying,
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    public, and in some countries other activities as well.

      To "convey" a work means any kind of propagation that enables other
    parties to make or receive copies.  Mere interaction with a user through
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      An interactive user interface displays "Appropriate Legal Notices"
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    work under this License, and how to view a copy of this License.  If
    the interface presents a list of user commands or options, such as a
    menu, a prominent item in the list meets this criterion.

      1. Source Code.

      The "source code" for a work means the preferred form of the work
    for making modifications to it.  "Object code" means any non-source
    form of a work.

      A "Standard Interface" means an interface that either is an official
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    interfaces specified for a particular programming language, one that
    is widely used among developers working in that language.

      The "System Libraries" of an executable work include anything, other
    than the work as a whole, that (a) is included in the normal form of
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      The "Corresponding Source" for a work in object code form means all
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      The Corresponding Source need not include anything that users
    can regenerate automatically from other parts of the Corresponding
    Source.

      The Corresponding Source for a work in source code form is that
    same work.

      2. Basic Permissions.

      All rights granted under this License are granted for the term of
    copyright on the Program, and are irrevocable provided the stated
    conditions are met.  This License explicitly affirms your unlimited
    permission to run the unmodified Program.  The output from running a
    covered work is covered by this License only if the output, given its
    content, constitutes a covered work.  This License acknowledges your
    rights of fair use or other equivalent, as provided by copyright law.

      You may make, run and propagate covered works that you do not
    convey, without conditions so long as your license otherwise remains
    in force.  You may convey covered works to others for the sole purpose
    of having them make modifications exclusively for you, or provide you
    with facilities for running those works, provided that you comply with
    the terms of this License in conveying all material for which you do
    not control copyright.  Those thus making or running the covered works
    for you must do so exclusively on your behalf, under your direction
    and control, on terms that prohibit them from making any copies of
    your copyrighted material outside their relationship with you.

      Conveying under any other circumstances is permitted solely under
    the conditions stated below.  Sublicensing is not allowed; section 10
    makes it unnecessary.

      3. Protecting Users' Legal Rights From Anti-Circumvention Law.

      No covered work shall be deemed part of an effective technological
    measure under any applicable law fulfilling obligations under article
    11 of the WIPO copyright treaty adopted on 20 December 1996, or
    similar laws prohibiting or restricting circumvention of such
    measures.

      When you convey a covered work, you waive any legal power to forbid
    circumvention of technological measures to the extent such circumvention
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    the covered work, and you disclaim any intention to limit operation or
    modification of the work as a means of enforcing, against the work's
    users, your or third parties' legal rights to forbid circumvention of
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      4. Conveying Verbatim Copies.

      You may convey verbatim copies of the Program's source code as you
    receive it, in any medium, provided that you conspicuously and
    appropriately publish on each copy an appropriate copyright notice;
    keep intact all notices stating that this License and any
    non-permissive terms added in accord with section 7 apply to the code;
    keep intact all notices of the absence of any warranty; and give all
    recipients a copy of this License along with the Program.

      You may charge any price or no price for each copy that you convey,
    and you may offer support or warranty protection for a fee.

      5. Conveying Modified Source Versions.

      You may convey a work based on the Program, or the modifications to
    produce it from the Program, in the form of source code under the
    terms of section 4, provided that you also meet all of these conditions:

        a) The work must carry prominent notices stating that you modified
        it, and giving a relevant date.

        b) The work must carry prominent notices stating that it is
        released under this License and any conditions added under section
        7.  This requirement modifies the requirement in section 4 to
        "keep intact all notices".

        c) You must license the entire work, as a whole, under this
        License to anyone who comes into possession of a copy.  This
        License will therefore apply, along with any applicable section 7
        additional terms, to the whole of the work, and all its parts,
        regardless of how they are packaged.  This License gives no
        permission to license the work in any other way, but it does not
        invalidate such permission if you have separately received it.

        d) If the work has interactive user interfaces, each must display
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        interfaces that do not display Appropriate Legal Notices, your
        work need not make them do so.

      A compilation of a covered work with other separate and independent
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    in or on a volume of a storage or distribution medium, is called an
    "aggregate" if the compilation and its resulting copyright are not
    used to limit the access or legal rights of the compilation's users
    beyond what the individual works permit.  Inclusion of a covered work
    in an aggregate does not cause this License to apply to the other
    parts of the aggregate.

      6. Conveying Non-Source Forms.

      You may convey a covered work in object code form under the terms
    of sections 4 and 5, provided that you also convey the
    machine-readable Corresponding Source under the terms of this License,
    in one of these ways:

        a) Convey the object code in, or embodied in, a physical product
        (including a physical distribution medium), accompanied by the
        Corresponding Source fixed on a durable physical medium
        customarily used for software interchange.

        b) Convey the object code in, or embodied in, a physical product
        (including a physical distribution medium), accompanied by a
        written offer, valid for at least three years and valid for as
        long as you offer spare parts or customer support for that product
        model, to give anyone who possesses the object code either (1) a
        copy of the Corresponding Source for all the software in the
        product that is covered by this License, on a durable physical
        medium customarily used for software interchange, for a price no
        more than your reasonable cost of physically performing this
        conveying of source, or (2) access to copy the
        Corresponding Source from a network server at no charge.

        c) Convey individual copies of the object code with a copy of the
        written offer to provide the Corresponding Source.  This
        alternative is allowed only occasionally and noncommercially, and
        only if you received the object code with such an offer, in accord
        with subsection 6b.

        d) Convey the object code by offering access from a designated
        place (gratis or for a charge), and offer equivalent access to the
        Corresponding Source in the same way through the same place at no
        further charge.  You need not require recipients to copy the
        Corresponding Source along with the object code.  If the place to
        copy the object code is a network server, the Corresponding Source
        may be on a different server (operated by you or a third party)
        that supports equivalent copying facilities, provided you maintain
        clear directions next to the object code saying where to find the
        Corresponding Source.  Regardless of what server hosts the
        Corresponding Source, you remain obligated to ensure that it is
        available for as long as needed to satisfy these requirements.

        e) Convey the object code using peer-to-peer transmission, provided
        you inform other peers where the object code and Corresponding
        Source of the work are being offered to the general public at no
        charge under subsection 6d.

      A separable portion of the object code, whose source code is excluded
    from the Corresponding Source as a System Library, need not be
    included in conveying the object code work.

      A "User Product" is either (1) a "consumer product", which means any
    tangible personal property which is normally used for personal, family,
    or household purposes, or (2) anything designed or sold for incorporation
    into a dwelling.  In determining whether a product is a consumer product,
    doubtful cases shall be resolved in favor of coverage.  For a particular
    product received by a particular user, "normally used" refers to a
    typical or common use of that class of product, regardless of the status
    of the particular user or of the way in which the particular user
    actually uses, or expects or is expected to use, the product.  A product
    is a consumer product regardless of whether the product has substantial
    commercial, industrial or non-consumer uses, unless such uses represent
    the only significant mode of use of the product.

      "Installation Information" for a User Product means any methods,
    procedures, authorization keys, or other information required to install
    and execute modified versions of a covered work in that User Product from
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    suffice to ensure that the continued functioning of the modified object
    code is in no case prevented or interfered with solely because
    modification has been made.

      If you convey an object code work under this section in, or with, or
    specifically for use in, a User Product, and the conveying occurs as
    part of a transaction in which the right of possession and use of the
    User Product is transferred to the recipient in perpetuity or for a
    fixed term (regardless of how the transaction is characterized), the
    Corresponding Source conveyed under this section must be accompanied
    by the Installation Information.  But this requirement does not apply
    if neither you nor any third party retains the ability to install
    modified object code on the User Product (for example, the work has
    been installed in ROM).

      The requirement to provide Installation Information does not include a
    requirement to continue to provide support service, warranty, or updates
    for a work that has been modified or installed by the recipient, or for
    the User Product in which it has been modified or installed.  Access to a
    network may be denied when the modification itself materially and
    adversely affects the operation of the network or violates the rules and
    protocols for communication across the network.

      Corresponding Source conveyed, and Installation Information provided,
    in accord with this section must be in a format that is publicly
    documented (and with an implementation available to the public in
    source code form), and must require no special password or key for
    unpacking, reading or copying.

      7. Additional Terms.

      "Additional permissions" are terms that supplement the terms of this
    License by making exceptions from one or more of its conditions.
    Additional permissions that are applicable to the entire Program shall
    be treated as though they were included in this License, to the extent
    that they are valid under applicable law.  If additional permissions
    apply only to part of the Program, that part may be used separately
    under those permissions, but the entire Program remains governed by
    this License without regard to the additional permissions.

      When you convey a copy of a covered work, you may at your option
    remove any additional permissions from that copy, or from any part of
    it.  (Additional permissions may be written to require their own
    removal in certain cases when you modify the work.)  You may place
    additional permissions on material, added by you to a covered work,
    for which you have or can give appropriate copyright permission.

      Notwithstanding any other provision of this License, for material you
    add to a covered work, you may (if authorized by the copyright holders of
    that material) supplement the terms of this License with terms:

        a) Disclaiming warranty or limiting liability differently from the
        terms of sections 15 and 16 of this License; or

        b) Requiring preservation of specified reasonable legal notices or
        author attributions in that material or in the Appropriate Legal
        Notices displayed by works containing it; or

        c) Prohibiting misrepresentation of the origin of that material, or
        requiring that modified versions of such material be marked in
        reasonable ways as different from the original version; or

        d) Limiting the use for publicity purposes of names of licensors or
        authors of the material; or

        e) Declining to grant rights under trademark law for use of some
        trade names, trademarks, or service marks; or

        f) Requiring indemnification of licensors and authors of that
        material by anyone who conveys the material (or modified versions of
        it) with contractual assumptions of liability to the recipient, for
        any liability that these contractual assumptions directly impose on
        those licensors and authors.

      All other non-permissive additional terms are considered "further
    restrictions" within the meaning of section 10.  If the Program as you
    received it, or any part of it, contains a notice stating that it is
    governed by this License along with a term that is a further
    restriction, you may remove that term.  If a license document contains
    a further restriction but permits relicensing or conveying under this
    License, you may add to a covered work material governed by the terms
    of that license document, provided that the further restriction does
    not survive such relicensing or conveying.

      If you add terms to a covered work in accord with this section, you
    must place, in the relevant source files, a statement of the
    additional terms that apply to those files, or a notice indicating
    where to find the applicable terms.

      Additional terms, permissive or non-permissive, may be stated in the
    form of a separately written license, or stated as exceptions;
    the above requirements apply either way.

      8. Termination.

      You may not propagate or modify a covered work except as expressly
    provided under this License.  Any attempt otherwise to propagate or
    modify it is void, and will automatically terminate your rights under
    this License (including any patent licenses granted under the third
    paragraph of section 11).

      However, if you cease all violation of this License, then your
    license from a particular copyright holder is reinstated (a)
    provisionally, unless and until the copyright holder explicitly and
    finally terminates your license, and (b) permanently, if the copyright
    holder fails to notify you of the violation by some reasonable means
    prior to 60 days after the cessation.

      Moreover, your license from a particular copyright holder is
    reinstated permanently if the copyright holder notifies you of the
    violation by some reasonable means, this is the first time you have
    received notice of violation of this License (for any work) from that
    copyright holder, and you cure the violation prior to 30 days after
    your receipt of the notice.

      Termination of your rights under this section does not terminate the
    licenses of parties who have received copies or rights from you under
    this License.  If your rights have been terminated and not permanently
    reinstated, you do not qualify to receive new licenses for the same
    material under section 10.

      9. Acceptance Not Required for Having Copies.

      You are not required to accept this License in order to receive or
    run a copy of the Program.  Ancillary propagation of a covered work
    occurring solely as a consequence of using peer-to-peer transmission
    to receive a copy likewise does not require acceptance.  However,
    nothing other than this License grants you permission to propagate or
    modify any covered work.  These actions infringe copyright if you do
    not accept this License.  Therefore, by modifying or propagating a
    covered work, you indicate your acceptance of this License to do so.

      10. Automatic Licensing of Downstream Recipients.

      Each time you convey a covered work, the recipient automatically
    receives a license from the original licensors, to run, modify and
    propagate that work, subject to this License.  You are not responsible
    for enforcing compliance by third parties with this License.

      An "entity transaction" is a transaction transferring control of an
    organization, or substantially all assets of one, or subdividing an
    organization, or merging organizations.  If propagation of a covered
    work results from an entity transaction, each party to that
    transaction who receives a copy of the work also receives whatever
    licenses to the work the party's predecessor in interest had or could
    give under the previous paragraph, plus a right to possession of the
    Corresponding Source of the work from the predecessor in interest, if
    the predecessor has it or can get it with reasonable efforts.

      You may not impose any further restrictions on the exercise of the
    rights granted or affirmed under this License.  For example, you may
    not impose a license fee, royalty, or other charge for exercise of
    rights granted under this License, and you may not initiate litigation
    (including a cross-claim or counterclaim in a lawsuit) alleging that
    any patent claim is infringed by making, using, selling, offering for
    sale, or importing the Program or any portion of it.

      11. Patents.

      A "contributor" is a copyright holder who authorizes use under this
    License of the Program or a work on which the Program is based.  The
    work thus licensed is called the contributor's "contributor version".

      A contributor's "essential patent claims" are all patent claims
    owned or controlled by the contributor, whether already acquired or
    hereafter acquired, that would be infringed by some manner, permitted
    by this License, of making, using, or selling its contributor version,
    but do not include claims that would be infringed only as a
    consequence of further modification of the contributor version.  For
    purposes of this definition, "control" includes the right to grant
    patent sublicenses in a manner consistent with the requirements of
    this License.

      Each contributor grants you a non-exclusive, worldwide, royalty-free
    patent license under the contributor's essential patent claims, to
    make, use, sell, offer for sale, import and otherwise run, modify and
    propagate the contents of its contributor version.

      In the following three paragraphs, a "patent license" is any express
    agreement or commitment, however denominated, not to enforce a patent
    (such as an express permission to practice a patent or covenant not to
    sue for patent infringement).  To "grant" such a patent license to a
    party means to make such an agreement or commitment not to enforce a
    patent against the party.

      If you convey a covered work, knowingly relying on a patent license,
    and the Corresponding Source of the work is not available for anyone
    to copy, free of charge and under the terms of this License, through a
    publicly available network server or other readily accessible means,
    then you must either (1) cause the Corresponding Source to be so
    available, or (2) arrange to deprive yourself of the benefit of the
    patent license for this particular work, or (3) arrange, in a manner
    consistent with the requirements of this License, to extend the patent
    license to downstream recipients.  "Knowingly relying" means you have
    actual knowledge that, but for the patent license, your conveying the
    covered work in a country, or your recipient's use of the covered work
    in a country, would infringe one or more identifiable patents in that
    country that you have reason to believe are valid.

      If, pursuant to or in connection with a single transaction or
    arrangement, you convey, or propagate by procuring conveyance of, a
    covered work, and grant a patent license to some of the parties
    receiving the covered work authorizing them to use, propagate, modify
    or convey a specific copy of the covered work, then the patent license
    you grant is automatically extended to all recipients of the covered
    work and works based on it.

      A patent license is "discriminatory" if it does not include within
    the scope of its coverage, prohibits the exercise of, or is
    conditioned on the non-exercise of one or more of the rights that are
    specifically granted under this License.  You may not convey a covered
    work if you are a party to an arrangement with a third party that is
    in the business of distributing software, under which you make payment
    to the third party based on the extent of your activity of conveying
    the work, and under which the third party grants, to any of the
    parties who would receive the covered work from you, a discriminatory
    patent license (a) in connection with copies of the covered work
    conveyed by you (or copies made from those copies), or (b) primarily
    for and in connection with specific products or compilations that
    contain the covered work, unless you entered into that arrangement,
    or that patent license was granted, prior to 28 March 2007.

      Nothing in this License shall be construed as excluding or limiting
    any implied license or other defenses to infringement that may
    otherwise be available to you under applicable patent law.

      12. No Surrender of Others' Freedom.

      If conditions are imposed on you (whether by court order, agreement or
    otherwise) that contradict the conditions of this License, they do not
    excuse you from the conditions of this License.  If you cannot convey a
    covered work so as to satisfy simultaneously your obligations under this
    License and any other pertinent obligations, then as a consequence you may
    not convey it at all.  For example, if you agree to terms that obligate you
    to collect a royalty for further conveying from those to whom you convey
    the Program, the only way you could satisfy both those terms and this
    License would be to refrain entirely from conveying the Program.

      13. Use with the GNU Affero General Public License.

      Notwithstanding any other provision of this License, you have
    permission to link or combine any covered work with a work licensed
    under version 3 of the GNU Affero General Public License into a single
    combined work, and to convey the resulting work.  The terms of this
    License will continue to apply to the part which is the covered work,
    but the special requirements of the GNU Affero General Public License,
    section 13, concerning interaction through a network will apply to the
    combination as such.

      14. Revised Versions of this License.

      The Free Software Foundation may publish revised and/or new versions of
    the GNU General Public License from time to time.  Such new versions will
    be similar in spirit to the present version, but may differ in detail to
    address new problems or concerns.

      Each version is given a distinguishing version number.  If the
    Program specifies that a certain numbered version of the GNU General
    Public License "or any later version" applies to it, you have the
    option of following the terms and conditions either of that numbered
    version or of any later version published by the Free Software
    Foundation.  If the Program does not specify a version number of the
    GNU General Public License, you may choose any version ever published
    by the Free Software Foundation.

      If the Program specifies that a proxy can decide which future
    versions of the GNU General Public License can be used, that proxy's
    public statement of acceptance of a version permanently authorizes you
    to choose that version for the Program.

      Later license versions may give you additional or different
    permissions.  However, no additional obligations are imposed on any
    author or copyright holder as a result of your choosing to follow a
    later version.

      15. Disclaimer of Warranty.

      THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
    APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
    HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
    OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
    THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
    PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
    IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
    ALL NECESSARY SERVICING, REPAIR OR CORRECTION.

      16. Limitation of Liability.

      IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
    WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
    THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
    GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
    USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
    DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
    PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
    EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
    SUCH DAMAGES.

      17. Interpretation of Sections 15 and 16.

      If the disclaimer of warranty and limitation of liability provided
    above cannot be given local legal effect according to their terms,
    reviewing courts shall apply local law that most closely approximates
    an absolute waiver of all civil liability in connection with the
    Program, unless a warranty or assumption of liability accompanies a
    copy of the Program in return for a fee.

                         END OF TERMS AND CONDITIONS

                How to Apply These Terms to Your New Programs

      If you develop a new program, and you want it to be of the greatest
    possible use to the public, the best way to achieve this is to make it
    free software which everyone can redistribute and change under these terms.

      To do so, attach the following notices to the program.  It is safest
    to attach them to the start of each source file to most effectively
    state the exclusion of warranty; and each file should have at least
    the "copyright" line and a pointer to where the full notice is found.

        _one line to give the program's name and a brief idea of what it does._
        Copyright (C) _year_  _name of author_

        This program is free software: you can redistribute it and/or modify
        it under the terms of the GNU General Public License as published by
        the Free Software Foundation, either version 3 of the License, or
        (at your option) any later version.

        This program is distributed in the hope that it will be useful,
        but WITHOUT ANY WARRANTY; without even the implied warranty of
        MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        GNU General Public License for more details.

        You should have received a copy of the GNU General Public License
        along with this program.  If not, see http://www.gnu.org/licenses/

    Also add information on how to contact you by electronic and paper mail.

      If the program does terminal interaction, make it output a short
    notice like this when it starts in an interactive mode:

        _program_  Copyright (C) _year_  _name of author_
        This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
        This is free software, and you are welcome to redistribute it
        under certain conditions; type `show c' for details.

    The hypothetical commands `show w' and `show c' should show the appropriate
    parts of the General Public License.  Of course, your program's commands
    might be different; for a GUI interface, you would use an "about box".

      You should also get your employer (if you work as a programmer) or school,
    if any, to sign a "copyright disclaimer" for the program, if necessary.
    For more information on this, and how to apply and follow the GNU GPL, see
    http://www.gnu.org/licenses/

      The GNU General Public License does not permit incorporating your program
    into proprietary programs.  If your program is a subroutine library, you
    may consider it more useful to permit linking proprietary applications with
    the library.  If this is what you want to do, use the GNU Lesser General
    Public License instead of this License.  But first, please read
    http://www.gnu.org/philosophy/why-not-lgpl.html

Lesser GPL

                       GNU LESSER GENERAL PUBLIC LICENSE
                           Version 3, 29 June 2007

     Copyright (C) 2007 Free Software Foundation, Inc. http://fsf.org/
     Everyone is permitted to copy and distribute verbatim copies
     of this license document, but changing it is not allowed.

      This version of the GNU Lesser General Public License incorporates
    the terms and conditions of version 3 of the GNU General Public
    License, supplemented by the additional permissions listed below.

      0. Additional Definitions.

      As used herein, "this License" refers to version 3 of the GNU Lesser
    General Public License, and the "GNU GPL" refers to version 3 of the GNU
    General Public License.

      "The Library" refers to a covered work governed by this License,
    other than an Application or a Combined Work as defined below.

      An "Application" is any work that makes use of an interface provided
    by the Library, but which is not otherwise based on the Library.
    Defining a subclass of a class defined by the Library is deemed a mode
    of using an interface provided by the Library.

      A "Combined Work" is a work produced by combining or linking an
    Application with the Library.  The particular version of the Library
    with which the Combined Work was made is also called the "Linked
    Version".

      The "Minimal Corresponding Source" for a Combined Work means the
    Corresponding Source for the Combined Work, excluding any source code
    for portions of the Combined Work that, considered in isolation, are
    based on the Application, and not on the Linked Version.

      The "Corresponding Application Code" for a Combined Work means the
    object code and/or source code for the Application, including any data
    and utility programs needed for reproducing the Combined Work from the
    Application, but excluding the System Libraries of the Combined Work.

      1. Exception to Section 3 of the GNU GPL.

      You may convey a covered work under sections 3 and 4 of this License
    without being bound by section 3 of the GNU GPL.

      2. Conveying Modified Versions.

      If you modify a copy of the Library, and, in your modifications, a
    facility refers to a function or data to be supplied by an Application
    that uses the facility (other than as an argument passed when the
    facility is invoked), then you may convey a copy of the modified
    version:

       a) under this License, provided that you make a good faith effort to
       ensure that, in the event an Application does not supply the
       function or data, the facility still operates, and performs
       whatever part of its purpose remains meaningful, or

       b) under the GNU GPL, with none of the additional permissions of
       this License applicable to that copy.

      3. Object Code Incorporating Material from Library Header Files.

      The object code form of an Application may incorporate material from
    a header file that is part of the Library.  You may convey such object
    code under terms of your choice, provided that, if the incorporated
    material is not limited to numerical parameters, data structure
    layouts and accessors, or small macros, inline functions and templates
    (ten or fewer lines in length), you do both of the following:

       a) Give prominent notice with each copy of the object code that the
       Library is used in it and that the Library and its use are
       covered by this License.

       b) Accompany the object code with a copy of the GNU GPL and this license
       document.

      4. Combined Works.

      You may convey a Combined Work under terms of your choice that,
    taken together, effectively do not restrict modification of the
    portions of the Library contained in the Combined Work and reverse
    engineering for debugging such modifications, if you also do each of
    the following:

       a) Give prominent notice with each copy of the Combined Work that
       the Library is used in it and that the Library and its use are
       covered by this License.

       b) Accompany the Combined Work with a copy of the GNU GPL and this license
       document.

       c) For a Combined Work that displays copyright notices during
       execution, include the copyright notice for the Library among
       these notices, as well as a reference directing the user to the
       copies of the GNU GPL and this license document.

       d) Do one of the following:

           0) Convey the Minimal Corresponding Source under the terms of this
           License, and the Corresponding Application Code in a form
           suitable for, and under terms that permit, the user to
           recombine or relink the Application with a modified version of
           the Linked Version to produce a modified Combined Work, in the
           manner specified by section 6 of the GNU GPL for conveying
           Corresponding Source.

           1) Use a suitable shared library mechanism for linking with the
           Library.  A suitable mechanism is one that (a) uses at run time
           a copy of the Library already present on the user's computer
           system, and (b) will operate properly with a modified version
           of the Library that is interface-compatible with the Linked
           Version.

       e) Provide Installation Information, but only if you would otherwise
       be required to provide such information under section 6 of the
       GNU GPL, and only to the extent that such information is
       necessary to install and execute a modified version of the
       Combined Work produced by recombining or relinking the
       Application with a modified version of the Linked Version. (If
       you use option 4d0, the Installation Information must accompany
       the Minimal Corresponding Source and Corresponding Application
       Code. If you use option 4d1, you must provide the Installation
       Information in the manner specified by section 6 of the GNU GPL
       for conveying Corresponding Source.)

      5. Combined Libraries.

      You may place library facilities that are a work based on the
    Library side by side in a single library together with other library
    facilities that are not Applications and are not covered by this
    License, and convey such a combined library under terms of your
    choice, if you do both of the following:

       a) Accompany the combined library with a copy of the same work based
       on the Library, uncombined with any other library facilities,
       conveyed under the terms of this License.

       b) Give prominent notice with the combined library that part of it
       is a work based on the Library, and explaining where to find the
       accompanying uncombined form of the same work.

      6. Revised Versions of the GNU Lesser General Public License.

      The Free Software Foundation may publish revised and/or new versions
    of the GNU Lesser General Public License from time to time. Such new
    versions will be similar in spirit to the present version, but may
    differ in detail to address new problems or concerns.

      Each version is given a distinguishing version number. If the
    Library as you received it specifies that a certain numbered version
    of the GNU Lesser General Public License "or any later version"
    applies to it, you have the option of following the terms and
    conditions either of that published version or of any later version
    published by the Free Software Foundation. If the Library as you
    received it does not specify a version number of the GNU Lesser
    General Public License, you may choose any version of the GNU Lesser
    General Public License ever published by the Free Software Foundation.

      If the Library as you received it specifies that a proxy can decide
    whether future versions of the GNU Lesser General Public License shall
    apply, that proxy's public statement of acceptance of any version is
    permanent authorization for you to choose that version for the
    Library.

### 3 FreeType

Web site: https://www.freetype.org/

FreeType is used under the FreeType License (FTL), a BSD-style license with a credit clause.

The text of the license follows.

                        The FreeType Project LICENSE
                        ----------------------------

                                2006-Jan-27

                        Copyright 1996-2002, 2006 by
              David Turner, Robert Wilhelm, and Werner Lemberg

    Introduction
    ============

      The FreeType  Project is distributed in  several archive packages;
      some of them may contain, in addition to the FreeType font engine,
      various tools and  contributions which rely on, or  relate to, the
      FreeType Project.

      This  license applies  to all  files found  in such  packages, and
      which do not  fall under their own explicit  license.  The license
      affects  thus  the  FreeType   font  engine,  the  test  programs,
      documentation and makefiles, at the very least.

      This  license   was  inspired  by  the  BSD,   Artistic,  and  IJG
      (Independent JPEG  Group) licenses, which  all encourage inclusion
      and  use of  free  software in  commercial  and freeware  products
      alike.  As a consequence, its main points are that:

        o We don't promise that this software works. However, we will be
          interested in any kind of bug reports. (`as is' distribution)

        o You can  use this software for whatever you  want, in parts or
          full form, without having to pay us. (`royalty-free' usage)

        o You may not pretend that  you wrote this software.  If you use
          it, or  only parts of it,  in a program,  you must acknowledge
          somewhere  in  your  documentation  that  you  have  used  the
          FreeType code. (`credits')

      We  specifically  permit  and  encourage  the  inclusion  of  this
      software, with  or without modifications,  in commercial products.
      We  disclaim  all warranties  covering  The  FreeType Project  and
      assume no liability related to The FreeType Project.

      Finally,  many  people  asked  us  for  a  preferred  form  for  a
      credit/disclaimer to use in compliance with this license.  We thus
      encourage you to use the following text:

       """
        Portions of this software are copyright ©  The FreeType
        Project (www.freetype.org).  All rights reserved.
       """

      Please replace  with the value from the FreeType version you
      actually use.

    Legal Terms
    ===========

    0. Definitions
    --------------

      Throughout this license,  the terms `package', `FreeType Project',
      and  `FreeType  archive' refer  to  the  set  of files  originally
      distributed  by the  authors  (David Turner,  Robert Wilhelm,  and
      Werner Lemberg) as the `FreeType Project', be they named as alpha,
      beta or final release.

      `You' refers to  the licensee, or person using  the project, where
      `using' is a generic term including compiling the project's source
      code as  well as linking it  to form a  `program' or `executable'.
      This  program is  referred to  as  `a program  using the  FreeType
      engine'.

      This  license applies  to all  files distributed  in  the original
      FreeType  Project,   including  all  source   code,  binaries  and
      documentation,  unless  otherwise  stated   in  the  file  in  its
      original, unmodified form as  distributed in the original archive.
      If you are  unsure whether or not a particular  file is covered by
      this license, you must contact us to verify this.

      The FreeType  Project is copyright (C) 1996-2000  by David Turner,
      Robert Wilhelm, and Werner Lemberg.  All rights reserved except as
      specified below.

    1. No Warranty
    --------------

      THE FREETYPE PROJECT  IS PROVIDED `AS IS' WITHOUT  WARRANTY OF ANY
      KIND, EITHER  EXPRESS OR IMPLIED,  INCLUDING, BUT NOT  LIMITED TO,
      WARRANTIES  OF  MERCHANTABILITY   AND  FITNESS  FOR  A  PARTICULAR
      PURPOSE.  IN NO EVENT WILL ANY OF THE AUTHORS OR COPYRIGHT HOLDERS
      BE LIABLE  FOR ANY DAMAGES CAUSED  BY THE USE OR  THE INABILITY TO
      USE, OF THE FREETYPE PROJECT.

    2. Redistribution
    -----------------

      This  license  grants  a  worldwide, royalty-free,  perpetual  and
      irrevocable right  and license to use,  execute, perform, compile,
      display,  copy,   create  derivative  works   of,  distribute  and
      sublicense the  FreeType Project (in  both source and  object code
      forms)  and  derivative works  thereof  for  any  purpose; and  to
      authorize others  to exercise  some or all  of the  rights granted
      herein, subject to the following conditions:

        o Redistribution of  source code  must retain this  license file
          (`FTL.TXT') unaltered; any  additions, deletions or changes to
          the original  files must be clearly  indicated in accompanying
          documentation.   The  copyright   notices  of  the  unaltered,
          original  files must  be  preserved in  all  copies of  source
          files.

        o Redistribution in binary form must provide a  disclaimer  that
          states  that  the software is based in part of the work of the
          FreeType Team,  in  the  distribution  documentation.  We also
          encourage you to put an URL to the FreeType web page  in  your
          documentation, though this isn't mandatory.

      These conditions  apply to any  software derived from or  based on
      the FreeType Project,  not just the unmodified files.   If you use
      our work, you  must acknowledge us.  However, no  fee need be paid
      to us.

    3. Advertising
    --------------

      Neither the  FreeType authors and  contributors nor you  shall use
      the name of the  other for commercial, advertising, or promotional
      purposes without specific prior written permission.

      We suggest,  but do not require, that  you use one or  more of the
      following phrases to refer  to this software in your documentation
      or advertising  materials: `FreeType Project',  `FreeType Engine',
      `FreeType library', or `FreeType Distribution'.

      As  you have  not signed  this license,  you are  not  required to
      accept  it.   However,  as  the FreeType  Project  is  copyrighted
      material, only  this license, or  another one contracted  with the
      authors, grants you  the right to use, distribute,  and modify it.
      Therefore,  by  using,  distributing,  or modifying  the  FreeType
      Project, you indicate that you understand and accept all the terms
      of this license.

    4. Contacts
    -----------

      There are two mailing lists related to FreeType:

        o freetype@nongnu.org

          Discusses general use and applications of FreeType, as well as
          future and  wanted additions to the  library and distribution.
          If  you are looking  for support,  start in  this list  if you
          haven't found anything to help you in the documentation.

        o freetype-devel@nongnu.org

          Discusses bugs,  as well  as engine internals,  design issues,
          specific licenses, porting, etc.

      Our home page can be found at

        http://www.freetype.org

    --- end of FTL.TXT ---

### 4 FreeImage

FreeImage is an Open Source library project for developers who would like to support popular graphics image formats like PNG, BMP, JPEG, TIFF and others as needed by today's multimedia applications. FreeImage is easy to use, fast, multithreading safe, compatible with all 32-bit or 64-bit versions of Windows, and cross-platform (works both with Linux and Mac OS X).

Web site: http://freeimage.sourceforge.net/

FreeImage is used only in Windows, Linux, and OS X versions of CAD Assistant, under the FreeImage Public License, Version 1.0.

The text of the license follows.

    FreeImage Public License - Version 1.0
    ---------------------------------------------

    1. Definitions.

    1.1. "Contributor" means each entity that creates or contributes to the creation of Modifications.

    1.2. "Contributor Version" means the combination of the Original Code, prior Modifications used by a Contributor, and the Modifications made by that particular Contributor.

    1.3. "Covered Code" means the Original Code or Modifications or the combination of the Original Code and Modifications, in each case including portions thereof.

    1.4. "Electronic Distribution Mechanism" means a mechanism generally accepted in the software development community for the electronic transfer of data.

    1.5. "Executable" means Covered Code in any form other than Source Code.

    1.6. "Initial Developer" means the individual or entity identified as the Initial Developer in the Source Code notice required by Exhibit A.

    1.7. "Larger Work" means a work which combines Covered Code or portions thereof with code not governed by the terms of this License.

    1.8. "License" means this document.

    1.9. "Modifications" means any addition to or deletion from the substance or structure of either the Original Code or any previous Modifications. When Covered Code is released as a series of files, a
    Modification is:

    A. Any addition to or deletion from the contents of a file containing Original Code or previous Modifications.

    B. Any new file that contains any part of the Original Code or previous Modifications.

    1.10. "Original Code" means Source Code of computer software code which is described in the Source Code notice required by Exhibit A as Original Code, and which, at the time of its release under this License is not already Covered Code governed by this License.

    1.11. "Source Code" means the preferred form of the Covered Code for making modifications to it, including all modules it contains, plus any associated interface definition files, scripts used to control
    compilation and installation of an Executable, or a list of source code differential comparisons against either the Original Code or another well known, available Covered Code of the Contributor's choice. The Source Code can be in a compressed or archival form, provided the appropriate decompression or de-archiving software is widely available for no charge.

    1.12. "You" means an individual or a legal entity exercising rights under, and complying with all of the terms of, this License or a future version of this License issued under Section 6.1. For legal entities, "You" includes any entity which controls, is controlled by, or is under common control with You. For purposes of this definition, "control" means (a) the power, direct or indirect, to cause the
    direction or management of such entity, whether by contract or otherwise, or (b) ownership of fifty percent (50%) or more of the outstanding shares or beneficial ownership of such entity.

    2. Source Code License.

    2.1. The Initial Developer Grant.
    The Initial Developer hereby grants You a world-wide, royalty-free, non-exclusive license, subject to third party intellectual property claims:

    (a) to use, reproduce, modify, display, perform, sublicense and distribute the Original Code (or portions thereof) with or without Modifications, or as part of a Larger Work; and

    (b) under patents now or hereafter owned or controlled by Initial Developer, to make, have made, use and sell ("Utilize") the Original Code (or portions thereof), but solely to the extent that
    any such patent is reasonably necessary to enable You to Utilize the Original Code (or portions thereof) and not to any greater extent that may be necessary to Utilize further Modifications or
    combinations.

    2.2. Contributor Grant.
    Each Contributor hereby grants You a world-wide, royalty-free, non-exclusive license, subject to third party intellectual property claims:

    (a) to use, reproduce, modify, display, perform, sublicense and distribute the Modifications created by such Contributor (or portions thereof) either on an unmodified basis, with other Modifications, as Covered Code or as part of a Larger Work; and

    (b) under patents now or hereafter owned or controlled by Contributor, to Utilize the Contributor Version (or portions thereof), but solely to the extent that any such patent is reasonably necessary to enable You to Utilize the Contributor Version (or portions thereof), and not to any greater extent that
    may be necessary to Utilize further Modifications or combinations.

    3. Distribution Obligations.

    3.1. Application of License.
    The Modifications which You create or to which You contribute are governed by the terms of this License, including without limitation Section 2.2. The Source Code version of Covered Code may be distributed only under the terms of this License or a future version of this License released under Section 6.1, and You must include a copy of this License with every copy of the Source Code You distribute. You may not offer or impose any terms on any Source Code version that alters or
    restricts the applicable version of this License or the recipients' rights hereunder. However, You may include an additional document offering the additional rights described in Section 3.5.

    3.2. Availability of Source Code.
    Any Modification which You create or to which You contribute must be made available in Source Code form under the terms of this License either on the same media as an Executable version or via an accepted Electronic Distribution Mechanism to anyone to whom you made an Executable version available; and if made available via Electronic Distribution Mechanism, must remain available for at least twelve (12) months after the date it initially became available, or at least six (6) months after a subsequent version of that particular Modification has been made available to such recipients. You are responsible for ensuring that the Source Code version remains available even if the Electronic Distribution Mechanism is maintained by a third party.

    3.3. Description of Modifications.
    You must cause all Covered Code to which you contribute to contain a file documenting the changes You made to create that Covered Code and the date of any change. You must include a prominent statement that the Modification is derived, directly or indirectly, from Original Code provided by the Initial Developer and including the name of the Initial Developer in (a) the Source Code, and (b) in any notice in an Executable version or related documentation in which You describe the origin or ownership of the Covered Code.

    3.4. Intellectual Property Matters

    (a) Third Party Claims.
    If You have knowledge that a party claims an intellectual property right in particular functionality or code (or its utilization under this License), you must include a text file with the source code distribution titled "LEGAL" which describes the claim and the party making the claim in sufficient detail that a recipient will know whom to contact. If you obtain such knowledge after You make Your Modification available as described in Section 3.2, You shall promptly modify the LEGAL file in all copies You make
    available thereafter and shall take other steps (such as notifying appropriate mailing lists or newsgroups) reasonably calculated to inform those who received the Covered Code that new knowledge has been obtained.

    (b) Contributor APIs.
    If Your Modification is an application programming interface and You own or control patents which are reasonably necessary to implement that API, you must also include this information in the LEGAL file.

    3.5. Required Notices.
    You must duplicate the notice in Exhibit A in each file of the Source Code, and this License in any documentation for the Source Code, where You describe recipients' rights relating to Covered Code. If You created one or more Modification(s), You may add your name as a Contributor to the notice described in Exhibit A. If it is not possible to put such notice in a particular Source Code file due to its
    structure, then you must include such notice in a location (such as a relevant directory file) where a user would be likely to look for such a notice. You may choose to offer, and to charge a fee for, warranty, support, indemnity or liability obligations to one or more recipients of Covered Code. However, You may do so only on Your own behalf, and not on behalf of the Initial Developer or any Contributor. You must make it absolutely clear than any such warranty, support, indemnity or
    liability obligation is offered by You alone, and You hereby agree to indemnify the Initial Developer and every Contributor for any liability incurred by the Initial Developer or such Contributor as a result of
    warranty, support, indemnity or liability terms You offer.

    3.6. Distribution of Executable Versions.
    You may distribute Covered Code in Executable form only if the requirements of Section 3.1-3.5 have been met for that Covered Code, and if You include a notice stating that the Source Code version of the Covered Code is available under the terms of this License, including a description of how and where You have fulfilled the obligations of Section 3.2. The notice must be conspicuously included in any notice in an Executable version, related documentation or collateral in which You
    describe recipients' rights relating to the Covered Code. You may distribute the Executable version of Covered Code under a license of Your choice, which may contain terms different from this License,
    provided that You are in compliance with the terms of this License and that the license for the Executable version does not attempt to limit or alter the recipient's rights in the Source Code version from the rights set forth in this License. If You distribute the Executable version under a different license You must make it absolutely clear that any terms which differ from this License are offered by You alone, not by the Initial Developer or any Contributor. You hereby agree to indemnify the Initial Developer and every Contributor for any liability incurred by the Initial Developer or such Contributor as a result of any such terms You offer.

    3.7. Larger Works.
    You may create a Larger Work by combining Covered Code with other code not governed by the terms of this License and distribute the Larger Work as a single product. In such a case, You must make sure the requirements of this License are fulfilled for the Covered Code.

    4. Inability to Comply Due to Statute or Regulation.

    If it is impossible for You to comply with any of the terms of this License with respect to some or all of the Covered Code due to statute or regulation then You must: (a) comply with the terms of this License to the maximum extent possible; and (b) describe the limitations and the code they affect. Such description must be included in the LEGAL file described in Section 3.4 and must be included with all distributions of the Source Code. Except to the extent prohibited by statute or regulation, such description must be sufficiently detailed for a recipient of ordinary skill to be able to understand it.

    5. Application of this License.

    This License applies to code to which the Initial Developer has attached the notice in Exhibit A, and to related Covered Code.

    6. Versions of the License.

    6.1. New Versions.
    Floris van den Berg may publish revised and/or new versions of the License from time to time. Each version will be given a distinguishing version number.

    6.2. Effect of New Versions.
    Once Covered Code has been published under a particular version of the License, You may always continue to use it under the terms of that version. You may also choose to use such Covered Code under the terms of any subsequent version of the License published by Floris van den Berg
    No one other than Floris van den Berg has the right to modify the terms applicable to Covered Code created under this License.

    6.3. Derivative Works.
    If you create or use a modified version of this License (which you may only do in order to apply it to code which is not already Covered Code governed by this License), you must (a) rename Your license so that the phrases "FreeImage", `FreeImage Public License", "FIPL", or any confusingly similar phrase do not appear anywhere in your license and (b) otherwise make it clear that your version of the license contains terms which differ from the FreeImage Public License. (Filling in the name of the Initial Developer, Original Code or Contributor in the notice described in Exhibit A shall not of themselves be deemed to be modifications of this License.)

    7. DISCLAIMER OF WARRANTY.

    COVERED CODE IS PROVIDED UNDER THIS LICENSE ON AN "AS IS" BASIS, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, WARRANTIES THAT THE COVERED CODE IS FREE OF DEFECTS, MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE OR NON-INFRINGING. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE COVERED CODE IS WITH YOU. SHOULD ANY COVERED CODE PROVE DEFECTIVE IN ANY RESPECT, YOU (NOT THE INITIAL DEVELOPER OR ANY OTHER CONTRIBUTOR) ASSUME THE COST OF ANY NECESSARY SERVICING, REPAIR OR CORRECTION. THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS LICENSE. NO USE OF ANY COVERED CODE IS AUTHORIZED HEREUNDER EXCEPT UNDER THIS DISCLAIMER.

    8. TERMINATION.

    This License and the rights granted hereunder will terminate automatically if You fail to comply with terms herein and fail to cure such breach within 30 days of becoming aware of the breach. All sublicenses to the Covered Code which are properly granted shall survive any termination of this License. Provisions which, by their nature, must remain in effect beyond the termination of this License shall survive.

    9. LIMITATION OF LIABILITY.

    UNDER NO CIRCUMSTANCES AND UNDER NO LEGAL THEORY, WHETHER TORT (INCLUDING NEGLIGENCE), CONTRACT, OR OTHERWISE, SHALL THE INITIAL DEVELOPER, ANY OTHER CONTRIBUTOR, OR ANY DISTRIBUTOR OF COVERED CODE, OR ANY SUPPLIER OF ANY OF SUCH PARTIES, BE LIABLE TO YOU OR ANY OTHER PERSON FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES OF ANY CHARACTER INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS OF GOODWILL, WORK STOPPAGE, COMPUTER FAILURE OR MALFUNCTION, OR ANY AND ALL OTHER COMMERCIAL DAMAGES OR LOSSES, EVEN IF SUCH PARTY SHALL HAVE BEEN INFORMED OF THE POSSIBILITY OF SUCH DAMAGES. THIS LIMITATION OF LIABILITY SHALL NOT APPLY TO LIABILITY FOR DEATH OR PERSONAL INJURY RESULTING FROM SUCH PARTY'S NEGLIGENCE TO THE EXTENT APPLICABLE LAW PROHIBITS SUCH LIMITATION. SOME JURISDICTIONS DO NOT ALLOW THE
    EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO THAT EXCLUSION AND LIMITATION MAY NOT APPLY TO YOU.

    10. U.S. GOVERNMENT END USERS.

    The Covered Code is a "commercial item," as that term is defined in 48 C.F.R. 2.101 (Oct. 1995), consisting of "commercial computer software" and "commercial computer software documentation," as such terms are used in 48 C.F.R. 12.212 (Sept. 1995). Consistent with 48 C.F.R. 12.212 and 48 C.F.R. 227.7202-1 through 227.7202-4 (June 1995), all U.S. Government End Users acquire Covered Code with only those rights set forth herein.

    11. MISCELLANEOUS.

    This License represents the complete agreement concerning subject matter hereof. If any provision of this License is held to be unenforceable, such provision shall be reformed only to the extent necessary to make it enforceable. This License shall be governed by Dutch law provisions (except to the extent applicable law, if any, provides otherwise), excluding its conflict-of-law provisions. With respect to disputes in which at least one party is a citizen of, or an entity chartered or registered to do business in, the The Netherlands: (a) unless otherwise agreed in writing, all disputes relating to this License (excepting any dispute relating to intellectual property rights) shall be subject to final and binding arbitration, with the losing party paying all costs of arbitration; (b) any arbitration relating to this Agreement shall be held in Almelo, The Netherlands; and (c) any litigation relating to this Agreement shall be subject to the jurisdiction of the court of Almelo, The Netherlands with the losing party responsible for costs, including without limitation, court costs and reasonable attorneys fees and expenses. Any law or regulation which provides that the language of a contract shall be construed against the drafter shall not apply to this License.

    12. RESPONSIBILITY FOR CLAIMS.

    Except in cases where another Contributor has failed to comply with Section 3.4, You are responsible for damages arising, directly or indirectly, out of Your utilization of rights under this License, based
    on the number of copies of Covered Code you made available, the revenues you received from utilizing such rights, and other relevant factors. You agree to work with affected parties to distribute
    responsibility on an equitable basis.

    EXHIBIT A.

    "The contents of this file are subject to the FreeImage Public License Version 1.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://home.wxs.nl/~flvdberg/freeimage-license.txt

    Software distributed under the License is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for the specific language governing rights and limitations under the License.

### 5 RPly

RPly is a library that lets applications read and write PLY files. The PLY file format is widely used to store geometric information, such as 3D models, but is general enough to be useful for other purposes.

Web site: http://w3.impa.br/~diego/software/rply/

RPly is used under the MIT license.

The text of the license follows.

    RPly 1.1.4 license
    Copyright © 2003-2015 Diego Nehab.

    Permission is hereby granted, free of charge, to any person obtaining a
    copy of this software and associated documentation files (the "Software"),
    to deal in the Software without restriction, including without limitation
    the rights to use, copy, modify, merge, publish, distribute, sublicense,
    and/or sell copies of the Software, and to permit persons to whom the
    Software is furnished to do so, subject to the following conditions:

    The above copyright notice and this permission notice shall be included in
    all copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
    FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
    DEALINGS IN THE SOFTWARE.

### 6 WinSparkle

WinSparkle is an easy-to-use software update library for Windows developers.

Web site: https://winsparkle.org/

WinSparkle is used only in Windows version of CAD Assistant, under the permissive MIT license. The text of the license follows.

    Copyright (c) 2009-2016 Vaclav Slavik

    Permission is hereby granted, free of charge, to any person obtaining a copy of
    this software and associated documentation files (the "Software"), to deal in
    the Software without restriction, including without limitation the rights to
    use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
    of the Software, and to permit persons to whom the Software is furnished to do
    so, subject to the following conditions:

    The above copyright notice and this permission notice shall be included in all
    copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
    SOFTWARE.

### 7 RapidJSON

RapidJSON is a JSON parser/generator.

Web site: http://rapidjson.org/

RapidJSON is used under the MIT license.

The text of the license follows.

    Tencent is pleased to support the open source community by making RapidJSON available.
    Copyright (C) 2015 THL A29 Limited, a Tencent company, and Milo Yip.  All rights reserved.

    Terms of the MIT License:
    --------------------------------------------------------------------

    Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"),
    to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
    and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

    The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
    IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

### 8 GNU C++ run-time

GNU C++ run-time library (libstdc++) is used by Android version of CAD Assistant under the GCC Runtime Library Exception version 3.1.

Web site: https://gcc.gnu.org/onlinedocs/libstdc++/manual/license.html

The text of the GNU Lesser General Public License version 3.0 is available above.

The text of the GCC Runtime Library Exception version 3.1

    GCC RUNTIME LIBRARY EXCEPTION

    Version 3.1, 31 March 2009

    Copyright (C) 2009 Free Software Foundation, Inc.

    Everyone is permitted to copy and distribute verbatim copies of this
    license document, but changing it is not allowed.

    This GCC Runtime Library Exception ("Exception") is an additional
    permission under section 7 of the GNU General Public License, version
    3 ("GPLv3"). It applies to a given file (the "Runtime Library") that
    bears a notice placed by the copyright holder of the file stating that
    the file is governed by GPLv3 along with this Exception.

    When you use GCC to compile a program, GCC may combine portions of
    certain GCC header files and runtime libraries with the compiled
    program. The purpose of this Exception is to allow compilation of
    non-GPL (including proprietary) programs to use, in this way, the
    header files and runtime libraries covered by this Exception.

    0. Definitions.

    A file is an "Independent Module" if it either requires the Runtime
    Library for execution after a Compilation Process, or makes use of an
    interface provided by the Runtime Library, but is not otherwise based
    on the Runtime Library.

    "GCC" means a version of the GNU Compiler Collection, with or without
    modifications, governed by version 3 (or a specified later version) of
    the GNU General Public License (GPL) with the option of using any
    subsequent versions published by the FSF.

    "GPL-compatible Software" is software whose conditions of propagation,
    modification and use would permit combination with GCC in accord with
    the license of GCC.

    "Target Code" refers to output from any compiler for a real or virtual
    target processor architecture, in executable form or suitable for
    input to an assembler, loader, linker and/or execution
    phase. Notwithstanding that, Target Code does not include data in any
    format that is used as a compiler intermediate representation, or used
    for producing a compiler intermediate representation.

    The "Compilation Process" transforms code entirely represented in
    non-intermediate languages designed for human-written code, and/or in
    Java Virtual Machine byte code, into Target Code. Thus, for example,
    use of source code generators and preprocessors need not be considered
    part of the Compilation Process, since the Compilation Process can be
    understood as starting with the output of the generators or
    preprocessors.

    A Compilation Process is "Eligible" if it is done using GCC, alone or
    with other GPL-compatible software, or if it is done without using any
    work based on GCC. For example, using non-GPL-compatible Software to
    optimize any GCC intermediate representations would not qualify as an
    Eligible Compilation Process.

    1. Grant of Additional Permission.

    You have permission to propagate a work of Target Code formed by
    combining the Runtime Library with Independent Modules, even if such
    propagation would otherwise violate the terms of GPLv3, provided that
    all Target Code was generated by Eligible Compilation Processes. You
    may then convey such a combination under terms of your choice,
    consistent with the licensing of the Independent Modules.

    2. No Weakening of GCC Copyleft.

    The availability of this Exception does not imply any general
    presumption that third-party software is unaffected by the copyleft
    requirements of the license of GCC.

### 9 Bullet

Bullet is an open-source physics engine.

Web site: https://pybullet.org

Bullet is used under zlib license. The text of the license follows.

    Bullet Continuous Collision Detection and Physics Library
    http://bulletphysics.org

    This software is provided 'as-is', without any express or implied warranty.
    In no event will the authors be held liable for any damages arising from the use of this software.
    Permission is granted to anyone to use this software for any purpose,
    including commercial applications, and to alter it and redistribute it freely,
    subject to the following restrictions:

    1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software.
       If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
    2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
    3. This notice may not be removed or altered from any source distribution.

### 10 openNURBS

openNURBS is an open-source library for 3DM file format support.

Web site: http://opennurbs.org/

    Copyright (c) 1993-2018 Robert McNeel & Associates. All Rights Reserved.

    Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software.

    THIS SOFTWARE IS PROVIDED "AS IS" WITHOUT EXPRESS OR IMPLIED WARRANTY. ALL IMPLIED WARRANTIES OF FITNESS FOR ANY PARTICULAR PURPOSE AND OF MERCHANTABILITY ARE HEREBY DISCLAIMED.

    openNURBS and Rhinoceros are a registered trademarks of Robert McNeel & Associates.

### 11 Open Asset Import Library

Open Asset Import Library (short name: Assimp) is an open-source library to import various well-known 3D model formats.

Web site: https://assimp.org/

Assimp is used under BSD license. The text of the license follows.

    Copyright (c) 2006-2016, assimp team
    All rights reserved.

    Redistribution and use of this software in source and binary forms,
    with or without modification, are permitted provided that the
    following conditions are met:

    * Redistributions of source code must retain the above
      copyright notice, this list of conditions and the
      following disclaimer.

    * Redistributions in binary form must reproduce the above
      copyright notice, this list of conditions and the
      following disclaimer in the documentation and/or other
      materials provided with the distribution.

    * Neither the name of the assimp team, nor the names of its
      contributors may be used to endorse or promote products
      derived from this software without specific prior
      written permission of the assimp team.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
    "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
    A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
    OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
    SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
    LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
    OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

### 12 OpenVR Library

OpenVR is an API and runtime that allows access to VR hardware.

Web site: https://github.com/ValveSoftware/openvr

OpenVR is used under BSD license. The text of the license follows.

    Copyright (c) 2015, Valve Corporation
    All rights reserved.

    Redistribution and use in source and binary forms, with or without modification,
    are permitted provided that the following conditions are met:

    1. Redistributions of source code must retain the above copyright notice, this
    list of conditions and the following disclaimer.

    2. Redistributions in binary form must reproduce the above copyright notice,
    this list of conditions and the following disclaimer in the documentation and/or
    other materials provided with the distribution.

    3. Neither the name of the copyright holder nor the names of its contributors
    may be used to endorse or promote products derived from this software without
    specific prior written permission.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
    ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
    WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
    DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
    ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
    (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
    LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
    ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.