- Qt 5.3
- GNU General Public License (GPL)
- Qt 5.3.0 Reference Documentation

# GNU General Public License (GPL)

Qt is available under the GPL (version 3).

The Qt Toolkit is Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies) and other contributors.

Contact: http://www.qt-project.org/legal

Reference: GNU General Public License

     You may use, distribute and copy the Qt GUI Toolkit under the terms of
     GNU General Public License version 3, which is displayed below.

                        GNU 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.

                                Preamble

      The GNU General Public License is a free, copyleft license for
    software and other kinds of works.

      The licenses for most software and other practical works are designed
    to take away your freedom to share and change the works.  By contrast,
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    share and change all versions of a program--to make sure it remains free
    software for all its users.  We, the Free Software Foundation, use the
    GNU General Public License for most of our software; it applies also to
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    your programs, too.

      When we speak of free software, we are referring to freedom, not
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      To protect your rights, we need to prevent others from denying you
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      Developers that use the GNU GPL protect your rights with two steps:
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      Some devices are designed to deny users access to install or run
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                           TERMS AND CONDITIONS

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      "This License" refers to version 3 of the GNU General Public License.

      "Copyright" also means copyright-like laws that apply to other kinds of
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      The "source code" for a work means the preferred form of the work
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      All rights granted under this License are granted for the term of
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      4. Conveying Verbatim Copies.

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      You may charge any price or no price for each copy that you convey,
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      5. Conveying Modified Source Versions.

      You may convey a work based on the Program, or the modifications to
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        a) The work must carry prominent notices stating that you modified
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        b) The work must carry prominent notices stating that it is
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        c) You must license the entire work, as a whole, under this
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      6. Conveying Non-Source Forms.

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        d) Convey the object code by offering access from a designated
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      A separable portion of the object code, whose source code is excluded
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      A "User Product" is either (1) a "consumer product", which means any
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      If you convey an object code work under this section in, or with, or
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    if neither you nor any third party retains the ability to install
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      The requirement to provide Installation Information does not include a
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      Corresponding Source conveyed, and Installation Information provided,
    in accord with this section must be in a format that is publicly
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      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
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    this License without regard to the additional permissions.

      When you convey a copy of a covered work, you may at your option
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      Notwithstanding any other provision of this License, for material you
    add to a covered work, you may (if authorized by the copyright holders of
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        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
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        e) Declining to grant rights under trademark law for use of some
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        f) Requiring indemnification of licensors and authors of that
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      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
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    a further restriction but permits relicensing or conveying under this
    License, you may add to a covered work material governed by the terms
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    not survive such relicensing or conveying.

      If you add terms to a covered work in accord with this section, you
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      Additional terms, permissive or non-permissive, may be stated in the
    form of a separately written license, or stated as exceptions;
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      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
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      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
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    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
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    licenses to the work the party's predecessor in interest had or could
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      You may not impose any further restrictions on the exercise of the
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    (including a cross-claim or counterclaim in a lawsuit) alleging that
    any patent claim is infringed by making, using, selling, offering for
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      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
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      Each contributor grants you a non-exclusive, worldwide, royalty-free
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    propagate the contents of its contributor version.

      In the following three paragraphs, a "patent license" is any express
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    sue for patent infringement).  To "grant" such a patent license to a
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      If you convey a covered work, knowingly relying on a patent license,
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    available, or (2) arrange to deprive yourself of the benefit of the
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    consistent with the requirements of this License, to extend the patent
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    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
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      If, pursuant to or in connection with a single transaction or
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    receiving the covered work authorizing them to use, propagate, modify
    or convey a specific copy of the covered work, then the patent license
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    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
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    in the business of distributing software, under which you make payment
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    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
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      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
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      Each version is given a distinguishing version number.  If the
    Program specifies that a certain numbered version of the GNU General
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    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
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    by the Free Software Foundation.

      If the Program specifies that a proxy can decide which future
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      Later license versions may give you additional or different
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    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,
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    IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
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      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
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      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>.