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2     The GNU Public License 2 in DocBook
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9
10<appendix id="gpl">
11  <appendixinfo>
12    <releaseinfo>
13      Version 2, June 1991
14    </releaseinfo>
15    <copyright>
16      <year>2000</year>
17      <holder>Free Software Foundation, Inc.</holder>
18    </copyright>
19    <legalnotice id="gpl-legalnotice">
20      <para>
21        <address>Free Software Foundation, Inc.
22          <street>51 Franklin St, Fifth Floor</street>,
23          <city>Boston</city>,
24          <state>MA</state> <postcode>02110-1301</postcode>
25          <country>USA</country>
26        </address>.
27      </para>
28      <para>
29        Everyone is permitted to copy and distribute verbatim copies
30        of this license document, but changing it is not allowed.
31      </para>
32    </legalnotice>
33  </appendixinfo>
34  <title>GNU General Public License</title>
35
36  <sect1 id="gpl-preamble">
37    <title>Preamble</title>
38   
39    <para>
40      The licenses for most software are designed to take away your
41      freedom to share and change it. By contrast, the GNU General Public
42      License is intended to guarantee your freedom to share and change
43      free software - to make sure the software is free for all its users.
44      This General Public License applies to most of the Free Software
45      Foundation's software and to any other program whose authors commit
46      to using it. (Some other Free Software Foundation software is covered
47      by the GNU Library General Public License instead.) You can apply it
48      to your programs, too.
49    </para>
50
51    <para>
52      When we speak of free software, we are referring to freedom, not price.
53      Our General Public Licenses are designed to make sure that you have the
54      freedom to distribute copies of free software (and charge for this
55      service if you wish), that you receive source code or can get it if you
56      want it, that you can change the software or use pieces of it in new free
57      programs; and that you know you can do these things.
58    </para>
59
60    <para>
61      To protect your rights, we need to make restrictions that forbid anyone
62      to deny you these rights or to ask you to surrender the rights. These
63      restrictions translate to certain responsibilities for you if you distribute
64      copies of the software, or if you modify it.
65    </para>
66
67    <para>
68      For example, if you distribute copies of such a program, whether gratis or
69      for a fee, you must give the recipients all the rights that you have. You
70      must make sure that they, too, receive or can get the source code. And you
71      must show them these terms so they know their rights.
72    </para>
73
74    <para>
75      We protect your rights with two steps:
76
77      <orderedlist numeration="arabic">
78        <listitem>
79          <para>
80            copyright the software, and
81          </para>
82        </listitem>
83        <listitem>
84          <para>
85            offer you this license which gives you legal permission to copy,
86            distribute and/or modify the software.
87          </para>
88        </listitem>
89      </orderedlist>
90    </para>
91
92    <para>
93      Also, for each author's protection and ours, we want to make certain that
94      everyone understands that there is no warranty for this free software. If
95      the software is modified by someone else and passed on, we want its
96      recipients to know that what they have is not the original, so that any
97      problems introduced by others will not reflect on the original authors'
98      reputations.
99    </para>
100
101    <para>
102      Finally, any free program is threatened constantly by software patents.
103      We wish to avoid the danger that redistributors of a free program will
104      individually obtain patent licenses, in effect making the program
105      proprietary. To prevent this, we have made it clear that any patent must be
106      licensed for everyone's free use or not licensed at all.
107    </para>
108
109    <para>
110      The precise terms and conditions for copying, distribution and modification
111      follow.
112    </para>
113
114  </sect1>
115
116  <sect1 id="gpl-terms">
117    <title>TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION</title>
118
119    <sect2 id="gpl-sect0">
120      <title>Section 0</title>
121      <para>
122        This License applies to any program or other work which contains a notice
123        placed by the copyright holder saying it may be distributed under the terms
124        of this General Public License. The "Program", below, refers to any such
125        program or work, and a <quote>work based on the Program</quote> means either
126        the Program or any derivative work under copyright law: that is to say, a
127        work containing the Program or a portion of it, either verbatim or with
128        modifications and/or translated into another language. (Hereinafter, translation
129        is included without limitation in the term <quote>modification</quote>.) Each
130        licensee is addressed as <quote>you</quote>.
131      </para>
132
133      <para>
134        Activities other than copying, distribution and modification are not covered by
135        this License; they are outside its scope. The act of running the Program is not
136        restricted, and the output from the Program is covered only if its contents
137        constitute a work based on the Program (independent of having been made by running
138        the Program). Whether that is true depends on what the Program does.
139      </para>
140    </sect2>
141
142    <sect2 id="gpl-sect1">
143      <title>Section 1</title>
144      <para>
145        You may copy and distribute verbatim copies of the Program's source code as you
146        receive it, in any medium, provided that you conspicuously and appropriately
147        publish on each copy an appropriate copyright notice and disclaimer of warranty;
148        keep intact all the notices that refer to this License and to the absence of any
149        warranty; and give any other recipients of the Program a copy of this License
150        along with the Program.
151      </para>
152     
153      <para>
154        You may charge a fee for the physical act of transferring a copy, and you may at
155        your option offer warranty protection in exchange for a fee.
156      </para>
157    </sect2>
158
159    <sect2 id="gpl-sect2">
160      <title>Section 2</title>
161      <para>
162        You may modify your copy or copies of the Program or any portion of it, thus
163        forming a work based on the Program, and copy and distribute such modifications
164        or work under the terms of <link linkend="gpl-sect1">Section 1</link> above, provided
165        that you also meet all of these conditions:
166
167        <orderedlist numeration="loweralpha">
168          <listitem>
169            <para>
170              You must cause the modified files to carry prominent notices stating that
171              you changed the files and the date of any change.
172            </para>
173          </listitem>
174          <listitem>
175            <para>
176              You must cause any work that you distribute or publish, that in whole or
177              in part contains or is derived from the Program or any part thereof, to be
178              licensed as a whole at no charge to all third parties under the terms of
179              this License.
180            </para>
181          </listitem>
182          <listitem>
183            <para>
184              If the modified program normally reads commands interactively when run, you
185              must cause it, when started running for such interactive use in the most
186              ordinary way, to print or display an announcement including an appropriate
187              copyright notice and a notice that there is no warranty (or else, saying
188              that you provide a warranty) and that users may redistribute the program
189              under these conditions, and telling the user how to view a copy of this
190              License.
191
192              <note>
193                <title>Exception:</title>
194                <para>
195                  If the Program itself is interactive but does not normally print such an
196                  announcement, your work based on the Program is not required to print an
197                  announcement.)
198                </para>
199              </note>
200
201            </para>
202          </listitem>
203        </orderedlist>
204      </para>
205
206      <para>
207        These requirements apply to the modified work as a whole. If identifiable sections
208        of that work are not derived from the Program, and can be reasonably considered
209        independent and separate works in themselves, then this License, and its terms,
210        do not apply to those sections when you distribute them as separate works. But when
211        you distribute the same sections as part of a whole which is a work based on the
212        Program, the distribution of the whole must be on the terms of this License, whose
213        permissions for other licensees extend to the entire whole, and thus to each and
214        every part regardless of who wrote it.
215      </para>
216
217      <para>
218        Thus, it is not the intent of this section to claim rights or contest your rights
219        to work written entirely by you; rather, the intent is to exercise the right to control
220        the distribution of derivative or collective works based on the Program.
221      </para>
222
223      <para>
224        In addition, mere aggregation of another work not based on the Program with the Program
225        (or with a work based on the Program) on a volume of a storage or distribution medium
226        does not bring the other work under the scope of this License.
227      </para>
228    </sect2>
229
230    <sect2 id="gpl-sect3">
231      <title>Section 3</title>
232
233      <para>
234        You may copy and distribute the Program (or a work based on it, under
235        <link linkend="gpl-sect2">Section 2</link> in object code or executable form under the terms of
236        <link linkend="gpl-sect1">Sections 1</link> and <link linkend="gpl-sect2">2</link> above provided that
237        you also do one of the following:
238
239        <orderedlist numeration="loweralpha">
240          <listitem>
241            <para>
242              Accompany it with the complete corresponding machine-readable source code, which
243              must be distributed under the terms of Sections 1 and 2 above on a medium
244              customarily used for software interchange; or,
245            </para>
246          </listitem>
247          <listitem>
248            <para>
249              Accompany it with a written offer, valid for at least three years, to give any
250              third party, for a charge no more than your cost of physically performing source
251              distribution, a complete machine-readable copy of the corresponding source code,
252              to be distributed under the terms of Sections 1 and 2 above on a medium customarily
253              used for software interchange; or,
254            </para>
255          </listitem>
256          <listitem>
257            <para>
258              Accompany it with the information you received as to the offer to distribute
259              corresponding source code. (This alternative is allowed only for noncommercial
260              distribution and only if you received the program in object code or executable form
261              with such an offer, in accord with Subsection b above.)
262            </para>
263          </listitem>
264        </orderedlist>
265      </para>
266
267      <para>
268        The source code for a work means the preferred form of the work for making modifications
269        to it. For an executable work, complete source code means all the source code for all modules
270        it contains, plus any associated interface definition files, plus the scripts used to control
271        compilation and installation of the executable. However, as a special exception, the source
272        code distributed need not include anything that is normally distributed (in either source or
273        binary form) with the major components (compiler, kernel, and so on) of the operating system
274        on which the executable runs, unless that component itself accompanies the executable.
275      </para>
276     
277      <para>
278        If distribution of executable or object code is made by offering access to copy from a
279        designated place, then offering equivalent access to copy the source code from the same place
280        counts as distribution of the source code, even though third parties are not compelled to
281        copy the source along with the object code.
282      </para>
283    </sect2>
284
285    <sect2 id="gpl-sect4">
286      <title>Section 4</title>
287     
288      <para>
289        You may not copy, modify, sublicense, or distribute the Program except as expressly provided
290        under this License. Any attempt otherwise to copy, modify, sublicense or distribute the
291        Program is void, and will automatically terminate your rights under this License. However,
292        parties who have received copies, or rights, from you under this License will not have their
293        licenses terminated so long as such parties remain in full compliance.
294      </para>
295    </sect2>
296
297    <sect2 id="gpl-sect5">
298      <title>Section 5</title>
299
300      <para>
301        You are not required to accept this License, since you have not signed it. However, nothing
302        else grants you permission to modify or distribute the Program or its derivative works.
303        These actions are prohibited by law if you do not accept this License. Therefore, by modifying
304        or distributing the Program (or any work based on the Program), you indicate your acceptance
305        of this License to do so, and all its terms and conditions for copying, distributing or
306        modifying the Program or works based on it.
307      </para>
308    </sect2>
309
310    <sect2 id="gpl-sect6">
311      <title>Section 6</title>
312
313      <para>
314        Each time you redistribute the Program (or any work based on the Program), the recipient
315        automatically receives a license from the original licensor to copy, distribute or modify
316        the Program subject to these terms and conditions. You may not impose any further restrictions
317        on the recipients' exercise of the rights granted herein. You are not responsible for enforcing
318        compliance by third parties to this License.
319      </para>
320    </sect2>
321
322    <sect2 id="gpl-sect7">
323      <title>Section 7</title>
324
325      <para>
326        If, as a consequence of a court judgment or allegation of patent infringement or for any other
327        reason (not limited to patent issues), conditions are imposed on you (whether by court order,
328        agreement or otherwise) that contradict the conditions of this License, they do not excuse you
329        from the conditions of this License. If you cannot distribute so as to satisfy simultaneously
330        your obligations under this License and any other pertinent obligations, then as a consequence
331        you may not distribute the Program at all. For example, if a patent license would not permit
332        royalty-free redistribution of the Program by all those who receive copies directly or
333        indirectly through you, then the only way you could satisfy both it and this License would be
334        to refrain entirely from distribution of the Program.
335      </para>
336
337      <para>
338        If any portion of this section is held invalid or unenforceable under any particular circumstance,
339        the balance of the section is intended to apply and the section as a whole is intended to apply
340        in other circumstances.
341      </para>
342
343      <para>
344        It is not the purpose of this section to induce you to infringe any patents or other property
345        right claims or to contest validity of any such claims; this section has the sole purpose of
346        protecting the integrity of the free software distribution system, which is implemented by public
347        license practices. Many people have made generous contributions to the wide range of software
348        distributed through that system in reliance on consistent application of that system; it is up
349        to the author/donor to decide if he or she is willing to distribute software through any other
350        system and a licensee cannot impose that choice.
351      </para>
352
353      <para>
354        This section is intended to make thoroughly clear what is believed to be a consequence of the
355        rest of this License.
356      </para>
357    </sect2>
358
359    <sect2 id="gpl-sect8">
360      <title>Section 8</title>
361
362      <para>
363        If the distribution and/or use of the Program is restricted in certain countries either by patents
364        or by copyrighted interfaces, the original copyright holder who places the Program under this License
365        may add an explicit geographical distribution limitation excluding those countries, so that
366        distribution is permitted only in or among countries not thus excluded. In such case, this License
367        incorporates the limitation as if written in the body of this License.
368      </para>
369    </sect2>
370
371    <sect2 id="gpl-sect9">
372      <title>Section 9</title>
373     
374      <para>
375        The Free Software Foundation may publish revised and/or new versions of the General Public License
376        from time to time. Such new versions will be similar in spirit to the present version, but may differ
377        in detail to address new problems or concerns.
378      </para>
379
380      <para>
381        Each version is given a distinguishing version number. If the Program specifies a version number of
382        this License which applies to it and "any later version", you have the option of following the terms
383        and conditions either of that version or of any later version published by the Free Software
384        Foundation. If the Program does not specify a version number of this License, you may choose any
385        version ever published by the Free Software Foundation.
386      </para>
387    </sect2>
388
389    <sect2 id="gpl-sect10">
390      <title>Section 10</title>
391
392      <para>
393        If you wish to incorporate parts of the Program into other free programs whose distribution
394        conditions are different, write to the author to ask for permission. For software which is copyrighted
395        by the Free Software Foundation, write to the Free Software Foundation; we sometimes make exceptions
396        for this. Our decision will be guided by the two goals of preserving the free status of all
397        derivatives of our free software and of promoting the sharing and reuse of software generally.
398      </para>
399    </sect2>
400
401    <sect2 id="gpl-sect11">
402      <title>NO WARRANTY</title>
403      <subtitle>Section 11</subtitle>
404
405      <para>
406        BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT
407        PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR
408        OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED,
409        INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
410        PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE
411        PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
412      </para>
413    </sect2>
414
415    <sect2 id="gpl-sect12">
416      <title>Section 12</title>
417
418      <para>
419        IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY COPYRIGHT HOLDER, OR
420        ANY OTHER PARTY WHO MAY MODIFY AND/OR REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU
421        FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
422        USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED
423        INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH
424        ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
425        DAMAGES.
426      </para>
427    </sect2>
428  </sect1>
429</appendix>
430
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