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<h1><a class="anchor" name="gtexenginelicense">GPL License, Version 3 </a></h1><div class="fragment"><pre class="fragment"> GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. &lt;http:<span class="comment">//fsf.org/&gt;</span>
Everyone is permitted to copy and distribute verbatim copies
of <span class="keyword">this</span> license document, but changing it is not allowed.
Preamble
The GNU General Public License is a free, copyleft license <span class="keywordflow">for</span>
software and other kinds of works.
The licenses <span class="keywordflow">for</span> 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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<span class="stringliteral">a further restriction but permits relicensing or conveying under this</span>
<span class="stringliteral">License, you may add to a covered work material governed by the terms</span>
<span class="stringliteral">of that license document, provided that the further restriction does</span>
<span class="stringliteral">not survive such relicensing or conveying.</span>
<span class="stringliteral"></span>
<span class="stringliteral"> If you add terms to a covered work in accord with this section, you</span>
<span class="stringliteral">must place, in the relevant source files, a statement of the</span>
<span class="stringliteral">additional terms that apply to those files, or a notice indicating</span>
<span class="stringliteral">where to find the applicable terms.</span>
<span class="stringliteral"></span>
<span class="stringliteral"> Additional terms, permissive or non-permissive, may be stated in the</span>
<span class="stringliteral">form of a separately written license, or stated as exceptions;</span>
<span class="stringliteral">the above requirements apply either way.</span>
<span class="stringliteral"></span>
<span class="stringliteral"> 8. Termination.</span>
<span class="stringliteral"></span>
<span class="stringliteral"> You may not propagate or modify a covered work except as expressly</span>
<span class="stringliteral">provided under this License. Any attempt otherwise to propagate or</span>
<span class="stringliteral">modify it is void, and will automatically terminate your rights under</span>
<span class="stringliteral">this License (including any patent licenses granted under the third</span>
<span class="stringliteral">paragraph of section 11).</span>
<span class="stringliteral"></span>
<span class="stringliteral"> However, if you cease all violation of this License, then your</span>
<span class="stringliteral">license from a particular copyright holder is reinstated (a)</span>
<span class="stringliteral">provisionally, unless and until the copyright holder explicitly and</span>
<span class="stringliteral">finally terminates your license, and (b) permanently, if the copyright</span>
<span class="stringliteral">holder fails to notify you of the violation by some reasonable means</span>
<span class="stringliteral">prior to 60 days after the cessation.</span>
<span class="stringliteral"></span>
<span class="stringliteral"> Moreover, your license from a particular copyright holder is</span>
<span class="stringliteral">reinstated permanently if the copyright holder notifies you of the</span>
<span class="stringliteral">violation by some reasonable means, this is the first time you have</span>
<span class="stringliteral">received notice of violation of this License (for any work) from that</span>
<span class="stringliteral">copyright holder, and you cure the violation prior to 30 days after</span>
<span class="stringliteral">your receipt of the notice.</span>
<span class="stringliteral"></span>
<span class="stringliteral"> Termination of your rights under this section does not terminate the</span>
<span class="stringliteral">licenses of parties who have received copies or rights from you under</span>
<span class="stringliteral">this License. If your rights have been terminated and not permanently</span>
<span class="stringliteral">reinstated, you do not qualify to receive new licenses for the same</span>
<span class="stringliteral">material under section 10.</span>
<span class="stringliteral"></span>
<span class="stringliteral"> 9. Acceptance Not Required for Having Copies.</span>
<span class="stringliteral"></span>
<span class="stringliteral"> You are not required to accept this License in order to receive or</span>
<span class="stringliteral">run a copy of the Program. Ancillary propagation of a covered work</span>
<span class="stringliteral">occurring solely as a consequence of using peer-to-peer transmission</span>
<span class="stringliteral">to receive a copy likewise does not require acceptance. However,</span>
<span class="stringliteral">nothing other than this License grants you permission to propagate or</span>
<span class="stringliteral">modify any covered work. These actions infringe copyright if you do</span>
<span class="stringliteral">not accept this License. Therefore, by modifying or propagating a</span>
<span class="stringliteral">covered work, you indicate your acceptance of this License to do so.</span>
<span class="stringliteral"></span>
<span class="stringliteral"> 10. Automatic Licensing of Downstream Recipients.</span>
<span class="stringliteral"></span>
<span class="stringliteral"> Each time you convey a covered work, the recipient automatically</span>
<span class="stringliteral">receives a license from the original licensors, to run, modify and</span>
<span class="stringliteral">propagate that work, subject to this License. You are not responsible</span>
<span class="stringliteral">for enforcing compliance by third parties with this License.</span>
<span class="stringliteral"></span>
<span class="stringliteral"> An "entity transaction" is a transaction transferring control of an</span>
<span class="stringliteral">organization, or substantially all assets of one, or subdividing an</span>
<span class="stringliteral">organization, or merging organizations. If propagation of a covered</span>
<span class="stringliteral">work results from an entity transaction, each party to that</span>
<span class="stringliteral">transaction who receives a copy of the work also receives whatever</span>
<span class="stringliteral">licenses to the work the party'</span>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, <span class="keywordflow">if</span>
the predecessor has it or can <span class="keyword">get</span> it with reasonable efforts.
You may not impose any further restrictions on the exercise of the
rights granted or affirmed under <span class="keyword">this</span> License. For example, you may
not impose a license fee, royalty, or other charge <span class="keywordflow">for</span> exercise of
rights granted under <span class="keyword">this</span> 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, <span class="keyword">using</span>, selling, offering <span class="keywordflow">for</span>
sale, or importing the Program or any portion of it.
11. Patents.
A <span class="stringliteral">"contributor"</span> is a copyright holder who authorizes use under <span class="keyword">this</span>
License of the Program or a work on which the Program is based. The
work thus licensed is called the contributor<span class="stringliteral">'s "contributor version".</span>
<span class="stringliteral"></span>
<span class="stringliteral"> A contributor'</span>s <span class="stringliteral">"essential patent claims"</span> 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 <span class="keyword">this</span> License, of making, <span class="keyword">using</span>, or selling its contributor version,
but <span class="keywordflow">do</span> not include claims that would be infringed only as a
consequence of further modification of the contributor version. For
purposes of <span class="keyword">this</span> definition, <span class="stringliteral">"control"</span> includes the right to grant
patent sublicenses in a manner consistent with the requirements of
<span class="keyword">this</span> License.
Each contributor grants you a non-exclusive, worldwide, royalty-free
patent license under the contributor<span class="stringliteral">'s essential patent claims, to</span>
<span class="stringliteral">make, use, sell, offer for sale, import and otherwise run, modify and</span>
<span class="stringliteral">propagate the contents of its contributor version.</span>
<span class="stringliteral"></span>
<span class="stringliteral"> In the following three paragraphs, a "patent license" is any express</span>
<span class="stringliteral">agreement or commitment, however denominated, not to enforce a patent</span>
<span class="stringliteral">(such as an express permission to practice a patent or covenant not to</span>
<span class="stringliteral">sue for patent infringement). To "grant" such a patent license to a</span>
<span class="stringliteral">party means to make such an agreement or commitment not to enforce a</span>
<span class="stringliteral">patent against the party.</span>
<span class="stringliteral"></span>
<span class="stringliteral"> If you convey a covered work, knowingly relying on a patent license,</span>
<span class="stringliteral">and the Corresponding Source of the work is not available for anyone</span>
<span class="stringliteral">to copy, free of charge and under the terms of this License, through a</span>
<span class="stringliteral">publicly available network server or other readily accessible means,</span>
<span class="stringliteral">then you must either (1) cause the Corresponding Source to be so</span>
<span class="stringliteral">available, or (2) arrange to deprive yourself of the benefit of the</span>
<span class="stringliteral">patent license for this particular work, or (3) arrange, in a manner</span>
<span class="stringliteral">consistent with the requirements of this License, to extend the patent</span>
<span class="stringliteral">license to downstream recipients. "Knowingly relying" means you have</span>
<span class="stringliteral">actual knowledge that, but for the patent license, your conveying the</span>
<span class="stringliteral">covered work in a country, or your recipient'</span>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 <span class="stringliteral">"discriminatory"</span> <span class="keywordflow">if</span> 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 <span class="keyword">this</span> License. You may not convey a covered
work <span class="keywordflow">if</span> 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.
&lt;one line to give the program's name and a brief idea of what it does.&gt;
Copyright (C) &lt;year&gt; &lt;name of author&gt;
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 &lt;http:<span class="comment">//www.gnu.org/licenses/&gt;.</span>
Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a <span class="keywordtype">short</span>
notice like this when it starts in an interactive mode:
&lt;program&gt; Copyright (C) &lt;year&gt; &lt;name of author&gt;
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
&lt;http:<span class="comment">//www.gnu.org/licenses/&gt;.</span>
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
&lt;http:<span class="comment">//www.gnu.org/philosophy/why-not-lgpl.html&gt;.</span>
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