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<h1>GNU General Public License</h1>
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<p><img SRC="philosophical-gnu-sm.jpe" ALT=" [image of a Philosophical GNU] " width="160"
height="200"></a><a HREF="http://www.gnu.org/graphics/philosophicalgnu.html"> </a><!-- It is best to not enumerate the translations here in a menu bar, --> <!-- It is best to have the users follow this link, so they have the FSF' --> <!-- explanation about translations being unofficial, etc. -->
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<li><a HREF="/copyleft/gpl-violation.html">What to do if you see a possible GPL violation</a>
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<li><a HREF="/copyleft/copyleft.html#translations">Translations of the GPL</a> </li>
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<h2>Table of Contents</h2>
<ul>
<li><a NAME="TOC1" HREF="gpl.html#SEC1">GNU GENERAL PUBLIC LICENSE</a> <ul>
<li><a NAME="TOC2" HREF="gpl.html#SEC2">Preamble</a> </li>
<li><a NAME="TOC3" HREF="gpl.html#SEC3">TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND
MODIFICATION</a> </li>
<li><a NAME="TOC4" HREF="gpl.html#SEC4">How to Apply These Terms to Your New Programs</a> </li>
</ul>
</li>
</ul>
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<h2><a NAME="SEC1" HREF="gpl.html#TOC1">GNU GENERAL PUBLIC LICENSE</a></h2>
<p>Version 2, June 1991 </p>
<pre>
Copyright (C) 1989, 1991 Free Software Foundation, Inc.
59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
</pre>
<h2><a NAME="SEC2" HREF="gpl.html#TOC2">Preamble</a></h2>
<p>The licenses for most software are designed to take away your freedom to share and
change it. By contrast, the GNU General Public License is intended to guarantee your
freedom to share and change free software--to make sure the software is free for all its
users. This General Public License applies to most of the Free Software Foundation's
software and to any other program whose authors commit to using it. (Some other Free
Software Foundation software is covered by the GNU Library General Public License
instead.) You can apply it to your programs, too. </p>
<p>When we speak of free software, we are referring to freedom, not price. Our General
Public Licenses are designed to make sure that you have the freedom to distribute copies
of free software (and charge for this service if you wish), that you receive source code
or can get it if you want it, that you can change the software or use pieces of it in new
free programs; and that you know you can do these things. </p>
<p>To protect your rights, we need to make restrictions that forbid anyone to deny you
these rights or to ask you to surrender the rights. These restrictions translate to
certain responsibilities for you if you distribute copies of the software, or if you
modify it. </p>
<p>For example, if you distribute copies of such a program, whether gratis or for a fee,
you must give the recipients all the rights that you have. You must make sure that they,
too, receive or can get the source code. And you must show them these terms so they know
their rights. </p>
<p>We protect your rights with two steps: (1) copyright the software, and (2) offer you
this license which gives you legal permission to copy, distribute and/or modify the
software. </p>
<p>Also, for each author's protection and ours, we want to make certain that everyone
understands that there is no warranty for this free software. If the software is modified
by someone else and passed on, we want its recipients to know that what they have is not
the original, so that any problems introduced by others will not reflect on the original
authors' reputations. </p>
<p>Finally, any free program is threatened constantly by software patents. We wish to
avoid the danger that redistributors of a free program will individually obtain patent
licenses, in effect making the program proprietary. To prevent this, we have made it clear
that any patent must be licensed for everyone's free use or not licensed at all. </p>
<p>The precise terms and conditions for copying, distribution and modification follow. </p>
<h2><a NAME="SEC3" HREF="gpl.html#TOC3">TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND
MODIFICATION</a></h2>
<p><strong>0.</strong> This License applies to any program or other work which contains a
notice placed by the copyright holder saying it may be distributed under the terms of this
General Public License. The "Program", below, refers to any such program or
work, and a "work based on the Program" means either the Program or any
derivative work under copyright law: that is to say, a work containing the Program or a
portion of it, either verbatim or with modifications and/or translated into another
language. (Hereinafter, translation is included without limitation in the term
"modification".) Each licensee is addressed as "you". </p>
<p>Activities other than copying, distribution and modification are not covered by this
License; they are outside its scope. The act of running the Program is not restricted, and
the output from the Program is covered only if its contents constitute a work based on the
Program (independent of having been made by running the Program). Whether that is true
depends on what the Program does. </p>
<p><strong>1.</strong> You may copy and distribute 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 and disclaimer of warranty; keep
intact all the notices that refer to this License and to the absence of any warranty; and
give any other recipients of the Program a copy of this License along with the Program. </p>
<p>You may charge a fee for the physical act of transferring a copy, and you may at your
option offer warranty protection in exchange for a fee. </p>
<p><strong>2.</strong> You may modify your copy or copies of the Program or any portion of
it, thus forming a work based on the Program, and copy and distribute such modifications
or work under the terms of Section 1 above, provided that you also meet all of these
conditions:
<ul>
<li><strong>a)</strong> You must cause the modified files to carry prominent notices stating
that you changed the files and the date of any change. </li>
<li><strong>b)</strong> You must cause any work that you distribute or publish, that in
whole or in part contains or is derived from the Program or any part thereof, to be
licensed as a whole at no charge to all third parties under the terms of this License. </li>
<li><strong>c)</strong> If the modified program normally reads commands interactively when
run, you must cause it, when started running for such interactive use in the most ordinary
way, to print or display an announcement including an appropriate copyright notice and a
notice that there is no warranty (or else, saying that you provide a warranty) and that
users may redistribute the program under these conditions, and telling the user how to
view a copy of this License. (Exception: if the Program itself is interactive but does not
normally print such an announcement, your work based on the Program is not required to
print an announcement.) </li>
</ul>
<p>These requirements apply to the modified work as a whole. If identifiable sections of
that work are not derived from the Program, and can be reasonably considered independent
and separate works in themselves, then this License, and its terms, do not apply to those
sections when you distribute them as separate works. But when you distribute the same
sections as part of a whole which is a work based on the Program, the distribution of the
whole must be on the terms of this License, whose permissions for other licensees extend
to the entire whole, and thus to each and every part regardless of who wrote it. </p>
<p>Thus, it is not the intent of this section to claim rights or contest your rights to
work written entirely by you; rather, the intent is to exercise the right to control the
distribution of derivative or collective works based on the Program. </p>
<p>In addition, mere aggregation of another work not based on the Program with the Program
(or with a work based on the Program) on a volume of a storage or distribution medium does
not bring the other work under the scope of this License. </p>
<p><strong>3.</strong> You may copy and distribute the Program (or a work based on it,
under Section 2) in object code or executable form under the terms of Sections 1 and 2
above provided that you also do one of the following: <!-- we use this doubled UL to get the sub-sections indented, --> <!-- while making the bullets as unobvious as possible. -->
<ul>
<li><strong>a)</strong> Accompany it with the complete corresponding machine-readable source
code, which must be distributed under the terms of Sections 1 and 2 above on a medium
customarily used for software interchange; or, </li>
<li><strong>b)</strong> Accompany it with a written offer, valid for at least three years,
to give any third party, for a charge no more than your cost of physically performing
source distribution, a complete machine-readable copy of the corresponding source code, to
be distributed under the terms of Sections 1 and 2 above on a medium customarily used for
software interchange; or, </li>
<li><strong>c)</strong> Accompany it with the information you received as to the offer to
distribute corresponding source code. (This alternative is allowed only for noncommercial
distribution and only if you received the program in object code or executable form with
such an offer, in accord with Subsection b above.) </li>
</ul>
<p>The source code for a work means the preferred form of the work for making
modifications to it. For an executable work, complete source code means all the source
code for all modules it contains, plus any associated interface definition files, plus the
scripts used to control compilation and installation of the executable. However, as a
special exception, the source code distributed need not include anything that is normally
distributed (in either source or binary form) with the major components (compiler, kernel,
and so on) of the operating system on which the executable runs, unless that component
itself accompanies the executable. </p>
<p>If distribution of executable or object code is made by offering access to copy from a
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