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GNU General Public License.htm
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html lang="en">
<head>
<title>GNU Autoconf Archive: General Public License</title>
<link rel="stylesheet" type="text/css" href="ac-archive.css">
</head>
<body>
<table summary="table used as formatting mechanism" width="100%">
<tbody>
<tr>
<td valign="middle" align="center">
<h1>GNU General Public License</h1>
</td>
</tr>
</tbody>
</table>
<hr>
<blockquote class="fontsf">
<p>Version 2, June 1991</p>
<p>Copyright (C) 1989, 1991 <a href="http://www.gnu.org/" hreflang="en"
rel="bookmark">Free Software Foundation</a>, Inc. 59 Temple Place - Suite
330, Boston, MA 02111-1307, USA</p>
<p>Everyone is permitted to copy and distribute verbatim copies of this
license document, but changing it is not allowed.</p>
</blockquote>
<hr>
<h2>Preamble</h2>
<div class="indent">
<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>
</div>
<h2>TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION</h2>
<div class="indent">
<ol class="numericol">
<li id="sect1">
<p>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>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>
</li>
<li id="sect2">
<p>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 <a href="#sect1" rev=
"section">Section 1</a> above, provided that you also meet all of these
conditions:</p>
<ol class="alphaol">
<li id="sect2a">You must cause the modified files to carry prominent
notices stating that you changed the files and the date of any
change.</li>
<li id="sect2b">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 id="sect2c">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>
</ol>
<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>
</li>
<li id="sect3">
<p>You may copy and distribute the Program (or a work based on it,
under <a href="#sect2" rev="section">Section 2</a>) in object code or
executable form under the terms of Sections <a href="#sect1" rev=
"section">1</a> and <a href="#sect2" rev="section">2</a> above provided
that you also do one of the following:</p>
<ol class="alphaol">
<li id="sect3a">Accompany it with the complete corresponding
machine-readable source code, which must be distributed under the
terms of Sections <a href="#sect1" rev="section">1</a> and <a href=
"#sect2" rev="section">2</a> above on a medium customarily used for
software interchange; or,</li>
<li id="sect3b">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 <a href="#sect1" rev=
"section">1</a> and <a href="#sect2" rev="section">2</a> above on a
medium customarily used for software interchange; or,</li>
<li id="sect3c">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 <a href="#sect3b" rev="subsection">Subsection
b</a> above.)</li>
</ol>
<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 designated place, then offering equivalent access
to copy the source code from the same place counts as distribution of
the source code, even though third parties are not compelled to copy
the source along with the object code.</p>
</li>
<li id="sect4">
<p>You may not copy, modify, sublicense, or distribute the Program
except as expressly provided under this License. Any attempt otherwise
to copy, modify, sublicense or distribute the Program is void, and will
automatically terminate your rights under this License. However,
parties who have received copies, or rights, from you under this
License will not have their licenses terminated so long as such parties
remain in full compliance.</p>
</li>
<li id="sect5">
<p>You are not required to accept this License, since you have not
signed it. However, nothing else grants you permission to modify or
distribute the Program or its derivative works. These actions are
prohibited by law if you do not accept this License. Therefore, by
modifying or distributing the Program (or any work based on the
Program), you indicate your acceptance of this License to do so, and
all its terms and conditions for copying, distributing or modifying the
Program or works based on it.</p>
</li>
<li id="sect6">
<p>Each time you redistribute the Program (or any work based on the
Program), the recipient automatically receives a license from the
original licensor to copy, distribute or modify the Program subject to
these terms and conditions. You may not impose any further restrictions
on the recipients' exercise of the rights granted herein. You are not
responsible for enforcing compliance by third parties to this
License.</p>
</li>
<li id="sect7">
<p>If, as a consequence of a court judgment or allegation of patent
infringement or for any other reason (not limited to patent issues),
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
distribute so as to satisfy simultaneously your obligations under this
License and any other pertinent obligations, then as a consequence you
may not distribute the Program at all. For example, if a patent license
would not permit royalty-free redistribution of the Program by all
those who receive copies directly or indirectly through you, then the
only way you could satisfy both it and this License would be to refrain
entirely from distribution of the Program.</p>
<p>If any portion of this section is held invalid or unenforceable
under any particular circumstance, the balance of the section is
intended to apply and the section as a whole is intended to apply in
other circumstances.</p>
<p>It is not the purpose of this section to induce you to infringe any
patents or other property right claims or to contest validity of any
such claims; this section has the sole purpose of protecting the
integrity of the free software distribution system, which is
implemented by public license practices. Many people have made generous
contributions to the wide range of software distributed through that
system in reliance on consistent application of that system; it is up
to the author/donor to decide if he or she is willing to distribute
software through any other system and a licensee cannot impose that
choice.</p>
<p>This section is intended to make thoroughly clear what is believed
to be a consequence of the rest of this License.</p>
</li>
<li id="sect8">
<p>If the distribution and/or use of the Program is restricted in
certain countries either by patents or by copyrighted interfaces, the
original copyright holder who places the Program under this License may
add an explicit geographical distribution limitation excluding those
countries, so that distribution is permitted only in or among countries
not thus excluded. In such case, this License incorporates the
limitation as if written in the body of this License.</p>
</li>
<li id="sect9">
<p>The Free Software Foundation may publish revised and/or new versions
of the 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.</p>
<p>Each version is given a distinguishing version number. If the
Program specifies a version number of this License which applies to it
and "any later version", you have the option of following the terms and
conditions either of that version or of any later version published by
the Free Software Foundation. If the Program does not specify a version
number of this License, you may choose any version ever published by
the Free Software Foundation.</p>
</li>
<li id="sect10">
<p>If you wish to incorporate parts of the Program into other free
programs whose distribution conditions are different, write to the
author to ask for permission. For software which is copyrighted by the
Free Software Foundation, write to the Free Software Foundation; we
sometimes make exceptions for this. Our decision will be guided by the
two goals of preserving the free status of all derivatives of our free
software and of promoting the sharing and reuse of software
generally.</p>
</li>
<li id="sect11">
<p>BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, 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.</p>
</li>
<li id="sect12">
<p>IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN
WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY
AND/OR REDISTRIBUTE 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.</p>
</li>
</ol>
</div>
<h2>END OF TERMS AND CONDITIONS</h2>
<hr>
</body>
</html>