path: root/doc/developer/gpl-appendix.xml

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<appendix id="gpl">
  <appendixinfo>
    <releaseinfo>
      Version 2, June 1991
    </releaseinfo>
    <copyright>
      <year>2000</year><holder>Free Software Foundation, Inc.</holder>
    </copyright>
    <legalnotice id="gpl-legalnotice">
      <para>
	<address>Free Software Foundation, Inc.
	  <street>51 Franklin Street, Fifth Floor</street>,
	  <city>Boston</city>,
	  <state>MA</state>
	  <postcode>02110-1335</postcode>
	  <country>USA</country>
	</address>
      </para>
      <para>
	Everyone is permitted to copy and distribute verbatim copies
	of this license document, but changing it is not allowed.
      </para>
    </legalnotice>
  </appendixinfo>
  <title>GNU General Public License</title>

  <sect1 id="gpl-preamble">
    <title>Preamble</title>

    <para>
      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.
    </para>

    <para>
      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.
    </para>

    <para>
      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.
    </para>

    <para>
      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.
    </para>

    <para>
      We protect your rights with two steps:

      <orderedlist numeration="arabic">
	<listitem>
	  <para>
	    copyright the software, and
	  </para>
	</listitem>
	<listitem>
	  <para>
	    offer you this license which gives you legal permission to
	    copy, distribute and/or modify the software.
	  </para>
	</listitem>
      </orderedlist>
    </para>

    <para>
      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.
    </para>

    <para>
      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.
    </para>

    <para>
      The precise terms and conditions for copying, distribution and
      modification follow.
    </para>

  </sect1>

  <sect1 id="gpl-terms">
    <title>TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION</title>

    <sect2 id="gpl-sect0">
      <title>Section 0</title>
      <para>
	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 <quote>work based on the Program</quote> 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 <quote>modification</quote>.)
	Each licensee is addressed as <quote>you</quote>.
      </para>

      <para>
	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.
      </para>
    </sect2>

    <sect2 id="gpl-sect1">
      <title>Section 1</title>
      <para>
	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.
      </para>

      <para>
	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.
      </para>
    </sect2>

    <sect2 id="gpl-sect2">
      <title>Section 2</title>
      <para>
	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 <link linkend="gpl-sect1">Section 1</link> above, provided
	that you also meet all of these conditions:

	<orderedlist numeration="loweralpha">
	  <listitem>
	    <para>
	      You must cause the modified files to carry prominent
	      notices stating that you changed the files and the date
	      of any change.
	    </para>
	  </listitem>
	  <listitem>
	    <para>
	      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.
	    </para>
	  </listitem>
	  <listitem>
	    <para>
	      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.

	      <note>
		<title>Exception:</title>
		<para>
		  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.)
		</para>
	      </note>

	    </para>
	  </listitem>
	</orderedlist>
      </para>

      <para>
	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.
      </para>

      <para>
	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.
      </para>

      <para>
	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.
      </para>
    </sect2>

    <sect2 id="gpl-sect3">
      <title>Section 3</title>

      <para>
	You may copy and distribute the Program (or a work based on
	it, under <link linkend="gpl-sect2">Section 2</link> in object
	code or executable form under the terms of <link
	linkend="gpl-sect1">Sections 1</link> and <link
	linkend="gpl-sect2">2</link> above provided that you also do
	one of the following:

	<orderedlist numeration="loweralpha">
	  <listitem>
	    <para>
	      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,
	    </para>
	  </listitem>
	  <listitem>
	    <para>
	      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,
	    </para>
	  </listitem>
	  <listitem>
	    <para>
	      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.)
	    </para>
	  </listitem>
	</orderedlist>
      </para>

      <para>
	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.
      </para>

      <para>
	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.
      </para>
    </sect2>

    <sect2 id="gpl-sect4">
      <title>Section 4</title>

      <para>
	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.
      </para>
    </sect2>

    <sect2 id="gpl-sect5">
      <title>Section 5</title>

      <para>
	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.
      </para>
    </sect2>

    <sect2 id="gpl-sect6">
      <title>Section 6</title>

      <para>
	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.
      </para>
    </sect2>

    <sect2 id="gpl-sect7">
      <title>Section 7</title>

      <para>
	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.
      </para>

      <para>
	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.
      </para>

      <para>
	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.
      </para>

      <para>
	This section is intended to make thoroughly clear what is
	believed to be a consequence of the rest of this License.
      </para>
    </sect2>

    <sect2 id="gpl-sect8">
      <title>Section 8</title>

      <para>
	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.
      </para>
    </sect2>

    <sect2 id="gpl-sect9">
      <title>Section 9</title>

      <para>
	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.
      </para>

      <para>
	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.
      </para>
    </sect2>

    <sect2 id="gpl-sect10">
      <title>Section 10</title>

      <para>
	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.
      </para>
    </sect2>

    <sect2 id="gpl-sect11">
      <title>NO WARRANTY</title>
      <subtitle>Section 11</subtitle>

      <para>
	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.
      </para>
    </sect2>

    <sect2 id="gpl-sect12">
      <title>Section 12</title>

      <para>
	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.
      </para>
    </sect2>
  </sect1>
</appendix>