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<td ><a href="index.html">Qt 5.9</a></td><td >GNU General Public License (GPL)</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right">Qt 5.9.4 Reference Documentation</td>
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<h3><a name="toc">Contents</a></h3>
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<li class="level1"><a href="#gpl-version-3">GPL version 3</a></li>
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<h1 class="title">GNU General Public License (GPL)</h1>
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<p>Qt is available under the GNU General Public License version 3.</p>
<p>The Qt Toolkit is Copyright (C) 2016 The Qt Company Ltd. and other contributors.<br />
Contact: <a href="http://www.qt.io/licensing/">http://www.qt.io/licensing/</a></p>
<p>Reference:</p>
<ul>
<li><a href="http://www.gnu.org/licenses/gpl.html">GNU General Public License (GPL), version 3</a></li>
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<a name="gpl-version-3"></a>
<h2 id="gpl-version-3">GPL version 3</h2>
<pre class="cpp">
You may use<span class="operator">,</span> distribute and copy the <span class="type">Qt</span> GUI Toolkit under the terms of
GNU General Public License version <span class="number">3</span><span class="operator">,</span> which is displayed below<span class="operator">.</span>
GNU GENERAL PUBLIC LICENSE
Version <span class="number">3</span><span class="operator">,</span> <span class="number">29</span> June <span class="number">2007</span>
Copyright (C) <span class="number">2007</span> Free Software Foundation<span class="operator">,</span> Inc<span class="operator">.</span> <span class="operator"><</span>http:<span class="comment">//fsf.org/></span>
Everyone is permitted to copy and distribute verbatim copies
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Preamble
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the predecessor has it <span class="keyword">or</span> can get it with reasonable efforts<span class="operator">.</span>
You may <span class="keyword">not</span> impose any further restrictions on the exercise of the
rights granted <span class="keyword">or</span> affirmed under <span class="keyword">this</span> License<span class="operator">.</span> For example<span class="operator">,</span> you may
<span class="keyword">not</span> impose a license fee<span class="operator">,</span> royalty<span class="operator">,</span> <span class="keyword">or</span> other charge <span class="keyword">for</span> exercise of
rights granted under <span class="keyword">this</span> License<span class="operator">,</span> and you may <span class="keyword">not</span> initiate litigation
(including a cross<span class="operator">-</span>claim <span class="keyword">or</span> counterclaim in a lawsuit) alleging that
any patent claim is infringed by making<span class="operator">,</span> <span class="keyword">using</span><span class="operator">,</span> selling<span class="operator">,</span> offering <span class="keyword">for</span>
sale<span class="operator">,</span> <span class="keyword">or</span> importing the Program <span class="keyword">or</span> any portion of it<span class="operator">.</span>
<span class="number">11.</span> Patents<span class="operator">.</span>
A <span class="string">"contributor"</span> is a copyright holder who authorizes use under <span class="keyword">this</span>
License of the Program <span class="keyword">or</span> a work on which the Program is based<span class="operator">.</span> The
work thus licensed is called the contributor<span class="char">'s "contributor version".
A contributor'</span>s <span class="string">"essential patent claims"</span> are all patent claims
owned <span class="keyword">or</span> controlled by the contributor<span class="operator">,</span> whether already acquired <span class="keyword">or</span>
hereafter acquired<span class="operator">,</span> that would be infringed by some manner<span class="operator">,</span> permitted
by <span class="keyword">this</span> License<span class="operator">,</span> of making<span class="operator">,</span> <span class="keyword">using</span><span class="operator">,</span> <span class="keyword">or</span> selling its contributor version<span class="operator">,</span>
but <span class="keyword">do</span> <span class="keyword">not</span> <span class="keyword">include</span> claims that would be infringed only as a
consequence of further modification of the contributor version<span class="operator">.</span> For
purposes of <span class="keyword">this</span> definition<span class="operator">,</span> <span class="string">"control"</span> includes the right to grant
patent sublicenses in a manner consistent with the requirements of
<span class="keyword">this</span> License<span class="operator">.</span>
Each contributor grants you a non<span class="operator">-</span>exclusive<span class="operator">,</span> worldwide<span class="operator">,</span> royalty<span class="operator">-</span>free
patent license under the contributor<span class="char">'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'</span>s use of the covered work
in a country<span class="operator">,</span> would infringe one <span class="keyword">or</span> more identifiable patents in that
country that you have reason to believe are valid<span class="operator">.</span>
If<span class="operator">,</span> pursuant to <span class="keyword">or</span> in connection with a single transaction <span class="keyword">or</span>
arrangement<span class="operator">,</span> you convey<span class="operator">,</span> <span class="keyword">or</span> propagate by procuring conveyance of<span class="operator">,</span> a
covered work<span class="operator">,</span> and grant a patent license to some of the parties
receiving the covered work authorizing them to use<span class="operator">,</span> propagate<span class="operator">,</span> modify
<span class="keyword">or</span> convey a specific copy of the covered work<span class="operator">,</span> then the patent license
you grant is automatically extended to all recipients of the covered
work and works based on it<span class="operator">.</span>
A patent license is <span class="string">"discriminatory"</span> <span class="keyword">if</span> it does <span class="keyword">not</span> <span class="keyword">include</span> within
the scope of its coverage<span class="operator">,</span> prohibits the exercise of<span class="operator">,</span> <span class="keyword">or</span> is
conditioned on the non<span class="operator">-</span>exercise of one <span class="keyword">or</span> more of the rights that are
specifically granted under <span class="keyword">this</span> License<span class="operator">.</span> You may <span class="keyword">not</span> convey a covered
work <span class="keyword">if</span> you are a party to an arrangement with a third party that is
in the business of distributing software<span class="operator">,</span> under which you make payment
to the third party based on the extent of your activity of conveying
the work<span class="operator">,</span> and under which the third party grants<span class="operator">,</span> to any of the
parties who would receive the covered work from you<span class="operator">,</span> a discriminatory
patent license (a) in connection with copies of the covered work
conveyed by you (<span class="keyword">or</span> copies made from those copies)<span class="operator">,</span> <span class="keyword">or</span> (b) primarily
<span class="keyword">for</span> and in connection with specific products <span class="keyword">or</span> compilations that
contain the covered work<span class="operator">,</span> unless you entered into that arrangement<span class="operator">,</span>
<span class="keyword">or</span> that patent license was granted<span class="operator">,</span> prior to <span class="number">28</span> March <span class="number">2007.</span>
Nothing in <span class="keyword">this</span> License shall be construed as excluding <span class="keyword">or</span> limiting
any implied license <span class="keyword">or</span> other defenses to infringement that may
otherwise be available to you under applicable patent law<span class="operator">.</span>
<span class="number">12.</span> No Surrender of Others<span class="char">' 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'</span>s
<span class="keyword">public</span> statement of acceptance of a version permanently authorizes you
to choose that version <span class="keyword">for</span> the Program<span class="operator">.</span>
Later license versions may give you additional <span class="keyword">or</span> different
permissions<span class="operator">.</span> However<span class="operator">,</span> no additional obligations are imposed on any
author <span class="keyword">or</span> copyright holder as a result of your choosing to follow a
later version<span class="operator">.</span>
<span class="number">15.</span> Disclaimer of Warranty<span class="operator">.</span>
THERE IS NO WARRANTY FOR THE PROGRAM<span class="operator">,</span> TO THE EXTENT PERMITTED BY
APPLICABLE LAW<span class="operator">.</span> EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
HOLDERS AND<span class="operator">/</span>OR OTHER PARTIES PROVIDE THE PROGRAM <span class="string">"AS IS"</span> WITHOUT WARRANTY
OF ANY KIND<span class="operator">,</span> EITHER EXPRESSED OR IMPLIED<span class="operator">,</span> INCLUDING<span class="operator">,</span> BUT NOT LIMITED TO<span class="operator">,</span>
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE<span class="operator">.</span> THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
IS WITH YOU<span class="operator">.</span> SHOULD THE PROGRAM PROVE DEFECTIVE<span class="operator">,</span> YOU ASSUME THE COST OF
ALL NECESSARY SERVICING<span class="operator">,</span> REPAIR OR CORRECTION<span class="operator">.</span>
<span class="number">16.</span> Limitation of Liability<span class="operator">.</span>
IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER<span class="operator">,</span> OR ANY OTHER PARTY WHO MODIFIES AND<span class="operator">/</span>OR CONVEYS
THE PROGRAM AS PERMITTED ABOVE<span class="operator">,</span> BE LIABLE TO YOU FOR DAMAGES<span class="operator">,</span> INCLUDING ANY
GENERAL<span class="operator">,</span> SPECIAL<span class="operator">,</span> 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)<span class="operator">,</span>
EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
SUCH DAMAGES<span class="operator">.</span>
<span class="number">17.</span> Interpretation of Sections <span class="number">15</span> and <span class="number">16.</span>
If the disclaimer of warranty and limitation of liability provided
above cannot be given local legal effect according to their terms<span class="operator">,</span>
reviewing courts shall apply local law that most closely approximates
an absolute waiver of all civil liability in connection with the
Program<span class="operator">,</span> unless a warranty <span class="keyword">or</span> assumption of liability accompanies a
copy of the Program in <span class="keyword">return</span> <span class="keyword">for</span> a fee<span class="operator">.</span>
END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a <span class="keyword">new</span> program<span class="operator">,</span> and you want it to be of the greatest
possible use to the <span class="keyword">public</span><span class="operator">,</span> the best way to achieve <span class="keyword">this</span> is to make it
free software which everyone can redistribute and change under these terms<span class="operator">.</span>
To <span class="keyword">do</span> so<span class="operator">,</span> attach the following notices to the program<span class="operator">.</span> 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 <span class="string">"copyright"</span> line and a pointer to where the full notice is found<span class="operator">.</span>
<span class="operator"><</span>one line to give the program<span class="char">'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'</span><span class="operator">.</span>
This is free software<span class="operator">,</span> and you are welcome to redistribute it
under certain conditions; type `show c<span class="char">' for details.
The hypothetical commands `show w'</span> and `show c<span class="char">' should show the appropriate
parts of the General Public License. Of course, your program'</span>s commands
might be different; <span class="keyword">for</span> a GUI interface<span class="operator">,</span> you would use an <span class="string">"about box"</span><span class="operator">.</span>
You should also get your employer (<span class="keyword">if</span> you work as a programmer) <span class="keyword">or</span> school<span class="operator">,</span>
<span class="keyword">if</span> any<span class="operator">,</span> to sign a <span class="string">"copyright disclaimer"</span> <span class="keyword">for</span> the program<span class="operator">,</span> <span class="keyword">if</span> necessary<span class="operator">.</span>
For more information on <span class="keyword">this</span><span class="operator">,</span> and how to apply and follow the GNU GPL<span class="operator">,</span> see
<span class="operator"><</span>http:<span class="comment">//www.gnu.org/licenses/>.</span>
The GNU General Public License does <span class="keyword">not</span> permit incorporating your program
into proprietary programs<span class="operator">.</span> If your program is a subroutine library<span class="operator">,</span> you
may consider it more useful to permit linking proprietary applications with
the library<span class="operator">.</span> If <span class="keyword">this</span> is what you want to <span class="keyword">do</span><span class="operator">,</span> use the GNU Lesser General
Public License instead of <span class="keyword">this</span> License<span class="operator">.</span> But first<span class="operator">,</span> please read
<span class="operator"><</span>http:<span class="comment">//www.gnu.org/philosophy/why-not-lgpl.html>.</span>
</pre>
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