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[Rockbox.git] / manual / appendix / gpl-2.0.tex
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1 %% \documentclass[a4paper,12pt]{article}
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3 %% \usepackage{times}
4 %% \usepackage[T1]{fontenc}
5 %% \usepackage[english]{babel}
7 %% \title{The GNU General Public License}
8 %% \date{}
10 %% \begin{document}
11 %% \maketitle
13 \begin{center}
14 {\parindent 0in
16 Version 2, June 1991
18 Copyright \copyright\ 1989, 1991 Free Software Foundation, Inc.
20 \bigskip
22 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
24 \bigskip
26 Everyone is permitted to copy and distribute verbatim copies
27 of this license document, but changing it is not allowed.
29 \end{center}
31 \subsection*{Preamble}
32 The licenses for most software are designed to take away your freedom to
33 share and change it. By contrast, the GNU General Public License is
34 intended to guarantee your freedom to share and change free software---to
35 make sure the software is free for all its users. This General Public
36 License applies to most of the Free Software Foundation's software and to
37 any other program whose authors commit to using it. (Some other Free
38 Software Foundation software is covered by the GNU Library General Public
39 License instead.) You can apply it to your programs, too.
41 When we speak of free software, we are referring to freedom, not price.
42 Our General Public Licenses are designed to make sure that you have the
43 freedom to distribute copies of free software (and charge for this service
44 if you wish), that you receive source code or can get it if you want it,
45 that you can change the software or use pieces of it in new free programs;
46 and that you know you can do these things.
48 To protect your rights, we need to make restrictions that forbid anyone to
49 deny you these rights or to ask you to surrender the rights. These
50 restrictions translate to certain responsibilities for you if you
51 distribute copies of the software, or if you modify it.
53 For example, if you distribute copies of such a program, whether gratis or
54 for a fee, you must give the recipients all the rights that you have. You
55 must make sure that they, too, receive or can get the source code. And
56 you must show them these terms so they know their rights.
58 We protect your rights with two steps: (1) copyright the software, and (2)
59 offer you this license which gives you legal permission to copy,
60 distribute and/or modify the software.
62 Also, for each author's protection and ours, we want to make certain that
63 everyone understands that there is no warranty for this free software. If
64 the software is modified by someone else and passed on, we want its
65 recipients to know that what they have is not the original, so that any
66 problems introduced by others will not reflect on the original authors'
67 reputations.
69 Finally, any free program is threatened constantly by software patents.
70 We wish to avoid the danger that redistributors of a free program will
71 individually obtain patent licenses, in effect making the program
72 proprietary. To prevent this, we have made it clear that any patent must
73 be licensed for everyone's free use or not licensed at all.
75 The precise terms and conditions for copying, distribution and
76 modification follow.
78 \begin{center}
79 {\Large \sc GNU General Public License
80 \\\vspace{3mm}Terms and Conditions For Copying, Distribution and Modification}
81 \end{center}
84 \begin{enumerate}
86 \addtocounter{enumi}{-1}
88 \item
90 This License applies to any program or other work which contains a notice
91 placed by the copyright holder saying it may be distributed under the
92 terms of this General Public License. The ``Program'', below, refers to
93 any such program or work, and a ``work based on the Program'' means either
94 the Program or any derivative work under copyright law: that is to say, a
95 work containing the Program or a portion of it, either verbatim or with
96 modifications and/or translated into another language. (Hereinafter,
97 translation is included without limitation in the term ``modification''.)
98 Each licensee is addressed as ``you''.
100 Activities other than copying, distribution and modification are not
101 covered by this License; they are outside its scope. The act of
102 running the Program is not restricted, and the output from the Program
103 is covered only if its contents constitute a work based on the
104 Program (independent of having been made by running the Program).
105 Whether that is true depends on what the Program does.
107 \item You may copy and distribute verbatim copies of the Program's source
108 code as you receive it, in any medium, provided that you conspicuously
109 and appropriately publish on each copy an appropriate copyright notice
110 and disclaimer of warranty; keep intact all the notices that refer to
111 this License and to the absence of any warranty; and give any other
112 recipients of the Program a copy of this License along with the Program.
114 You may charge a fee for the physical act of transferring a copy, and you
115 may at your option offer warranty protection in exchange for a fee.
117 \item
119 You may modify your copy or copies of the Program or any portion
120 of it, thus forming a work based on the Program, and copy and
121 distribute such modifications or work under the terms of Section 1
122 above, provided that you also meet all of these conditions:
124 \begin{enumerate}
126 \item
128 You must cause the modified files to carry prominent notices stating that
129 you changed the files and the date of any change.
131 \item
133 You must cause any work that you distribute or publish, that in
134 whole or in part contains or is derived from the Program or any
135 part thereof, to be licensed as a whole at no charge to all third
136 parties under the terms of this License.
138 \item
139 If the modified program normally reads commands interactively
140 when run, you must cause it, when started running for such
141 interactive use in the most ordinary way, to print or display an
142 announcement including an appropriate copyright notice and a
143 notice that there is no warranty (or else, saying that you provide
144 a warranty) and that users may redistribute the program under
145 these conditions, and telling the user how to view a copy of this
146 License. (Exception: if the Program itself is interactive but
147 does not normally print such an announcement, your work based on
148 the Program is not required to print an announcement.)
150 \end{enumerate}
153 These requirements apply to the modified work as a whole. If
154 identifiable sections of that work are not derived from the Program,
155 and can be reasonably considered independent and separate works in
156 themselves, then this License, and its terms, do not apply to those
157 sections when you distribute them as separate works. But when you
158 distribute the same sections as part of a whole which is a work based
159 on the Program, the distribution of the whole must be on the terms of
160 this License, whose permissions for other licensees extend to the
161 entire whole, and thus to each and every part regardless of who wrote it.
163 Thus, it is not the intent of this section to claim rights or contest
164 your rights to work written entirely by you; rather, the intent is to
165 exercise the right to control the distribution of derivative or
166 collective works based on the Program.
168 In addition, mere aggregation of another work not based on the Program
169 with the Program (or with a work based on the Program) on a volume of
170 a storage or distribution medium does not bring the other work under
171 the scope of this License.
173 \item
174 You may copy and distribute the Program (or a work based on it,
175 under Section 2) in object code or executable form under the terms of
176 Sections 1 and 2 above provided that you also do one of the following:
178 \begin{enumerate}
180 \item
182 Accompany it with the complete corresponding machine-readable
183 source code, which must be distributed under the terms of Sections
184 1 and 2 above on a medium customarily used for software interchange; or,
186 \item
188 Accompany it with a written offer, valid for at least three
189 years, to give any third party, for a charge no more than your
190 cost of physically performing source distribution, a complete
191 machine-readable copy of the corresponding source code, to be
192 distributed under the terms of Sections 1 and 2 above on a medium
193 customarily used for software interchange; or,
195 \item
197 Accompany it with the information you received as to the offer
198 to distribute corresponding source code. (This alternative is
199 allowed only for noncommercial distribution and only if you
200 received the program in object code or executable form with such
201 an offer, in accord with Subsection b above.)
203 \end{enumerate}
206 The source code for a work means the preferred form of the work for
207 making modifications to it. For an executable work, complete source
208 code means all the source code for all modules it contains, plus any
209 associated interface definition files, plus the scripts used to
210 control compilation and installation of the executable. However, as a
211 special exception, the source code distributed need not include
212 anything that is normally distributed (in either source or binary
213 form) with the major components (compiler, kernel, and so on) of the
214 operating system on which the executable runs, unless that component
215 itself accompanies the executable.
217 If distribution of executable or object code is made by offering
218 access to copy from a designated place, then offering equivalent
219 access to copy the source code from the same place counts as
220 distribution of the source code, even though third parties are not
221 compelled to copy the source along with the object code.
223 \item
224 You may not copy, modify, sublicense, or distribute the Program
225 except as expressly provided under this License. Any attempt
226 otherwise to copy, modify, sublicense or distribute the Program is
227 void, and will automatically terminate your rights under this License.
228 However, parties who have received copies, or rights, from you under
229 this License will not have their licenses terminated so long as such
230 parties remain in full compliance.
232 \item
233 You are not required to accept this License, since you have not
234 signed it. However, nothing else grants you permission to modify or
235 distribute the Program or its derivative works. These actions are
236 prohibited by law if you do not accept this License. Therefore, by
237 modifying or distributing the Program (or any work based on the
238 Program), you indicate your acceptance of this License to do so, and
239 all its terms and conditions for copying, distributing or modifying
240 the Program or works based on it.
242 \item
243 Each time you redistribute the Program (or any work based on the
244 Program), the recipient automatically receives a license from the
245 original licensor to copy, distribute or modify the Program subject to
246 these terms and conditions. You may not impose any further
247 restrictions on the recipients' exercise of the rights granted herein.
248 You are not responsible for enforcing compliance by third parties to
249 this License.
251 \item
252 If, as a consequence of a court judgment or allegation of patent
253 infringement or for any other reason (not limited to patent issues),
254 conditions are imposed on you (whether by court order, agreement or
255 otherwise) that contradict the conditions of this License, they do not
256 excuse you from the conditions of this License. If you cannot
257 distribute so as to satisfy simultaneously your obligations under this
258 License and any other pertinent obligations, then as a consequence you
259 may not distribute the Program at all. For example, if a patent
260 license would not permit royalty-free redistribution of the Program by
261 all those who receive copies directly or indirectly through you, then
262 the only way you could satisfy both it and this License would be to
263 refrain entirely from distribution of the Program.
265 If any portion of this section is held invalid or unenforceable under
266 any particular circumstance, the balance of the section is intended to
267 apply and the section as a whole is intended to apply in other
268 circumstances.
270 It is not the purpose of this section to induce you to infringe any
271 patents or other property right claims or to contest validity of any
272 such claims; this section has the sole purpose of protecting the
273 integrity of the free software distribution system, which is
274 implemented by public license practices. Many people have made
275 generous contributions to the wide range of software distributed
276 through that system in reliance on consistent application of that
277 system; it is up to the author/donor to decide if he or she is willing
278 to distribute software through any other system and a licensee cannot
279 impose that choice.
281 This section is intended to make thoroughly clear what is believed to
282 be a consequence of the rest of this License.
284 \item
285 If the distribution and/or use of the Program is restricted in
286 certain countries either by patents or by copyrighted interfaces, the
287 original copyright holder who places the Program under this License
288 may add an explicit geographical distribution limitation excluding
289 those countries, so that distribution is permitted only in or among
290 countries not thus excluded. In such case, this License incorporates
291 the limitation as if written in the body of this License.
293 \item
294 The Free Software Foundation may publish revised and/or new versions
295 of the General Public License from time to time. Such new versions will
296 be similar in spirit to the present version, but may differ in detail to
297 address new problems or concerns.
299 Each version is given a distinguishing version number. If the Program
300 specifies a version number of this License which applies to it and ``any
301 later version'', you have the option of following the terms and conditions
302 either of that version or of any later version published by the Free
303 Software Foundation. If the Program does not specify a version number of
304 this License, you may choose any version ever published by the Free Software
305 Foundation.
307 \item
308 If you wish to incorporate parts of the Program into other free
309 programs whose distribution conditions are different, write to the author
310 to ask for permission. For software which is copyrighted by the Free
311 Software Foundation, write to the Free Software Foundation; we sometimes
312 make exceptions for this. Our decision will be guided by the two goals
313 of preserving the free status of all derivatives of our free software and
314 of promoting the sharing and reuse of software generally.
316 \begin{center}
317 {\Large\sc
318 No Warranty
320 \end{center}
322 \item
323 {\sc Because the program is licensed free of charge, there is no warranty
324 for the program, to the extent permitted by applicable law. Except when
325 otherwise stated in writing the copyright holders and/or other parties
326 provide the program ``as is'' without warranty of any kind, either expressed
327 or implied, including, but not limited to, the implied warranties of
328 merchantability and fitness for a particular purpose. The entire risk as
329 to the quality and performance of the program is with you. Should the
330 program prove defective, you assume the cost of all necessary servicing,
331 repair or correction.}
333 \item
334 {\sc In no event unless required by applicable law or agreed to in writing
335 will any copyright holder, or any other party who may modify and/or
336 redistribute the program as permitted above, be liable to you for damages,
337 including any general, special, incidental or consequential damages arising
338 out of the use or inability to use the program (including but not limited
339 to loss of data or data being rendered inaccurate or losses sustained by
340 you or third parties or a failure of the program to operate with any other
341 programs), even if such holder or other party has been advised of the
342 possibility of such damages.}
344 \end{enumerate}
347 \begin{center}
348 {\Large\sc End of Terms and Conditions}
349 \end{center}
352 \pagebreak[2]
354 \section*{Appendix: How to Apply These Terms to Your New Programs}
356 If you develop a new program, and you want it to be of the greatest
357 possible use to the public, the best way to achieve this is to make it
358 free software which everyone can redistribute and change under these
359 terms.
361 To do so, attach the following notices to the program. It is safest to
362 attach them to the start of each source file to most effectively convey
363 the exclusion of warranty; and each file should have at least the
364 ``copyright'' line and a pointer to where the full notice is found.
366 \begin{quote}
367 {\textless}one line to give the program's name and a brief idea of what it
368 does.{\textgreater} \\
369 Copyright (C) {\textless}year{\textgreater} {\textless}name of
370 author{\textgreater} \\
372 This program is free software; you can redistribute it and/or modify
373 it under the terms of the GNU General Public License as published by
374 the Free Software Foundation; either version 2 of the License, or
375 (at your option) any later version.
377 This program is distributed in the hope that it will be useful,
378 but WITHOUT ANY WARRANTY; without even the implied warranty of
379 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
380 GNU General Public License for more details.
382 You should have received a copy of the GNU General Public License
383 along with this program; if not, write to the Free Software
384 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
385 \end{quote}
387 Also add information on how to contact you by electronic and paper mail.
389 If the program is interactive, make it output a short notice like this
390 when it starts in an interactive mode:
392 \begin{quote}
393 Gnomovision version 69, Copyright (C) {\textless}year{\textgreater}
394 {\textless}name of author{\textgreater} \\
395 Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. \\
396 This is free software, and you are welcome to redistribute it
397 under certain conditions; type `show c' for details.
398 \end{quote}
401 The hypothetical commands {\tt show w} and {\tt show c} should show the
402 appropriate parts of the General Public License. Of course, the commands
403 you use may be called something other than {\tt show w} and {\tt show c};
404 they could even be mouse-clicks or menu items---whatever suits your
405 program.
407 You should also get your employer (if you work as a programmer) or your
408 school, if any, to sign a ``copyright disclaimer'' for the program, if
409 necessary. Here is a sample; alter the names:
411 \begin{quote}
412 Yoyodyne, Inc., hereby disclaims all copyright interest in the program \\
413 `Gnomovision' (which makes passes at compilers) written by James Hacker. \\
415 {\textless}signature of Ty Coon{\textgreater}, 1 April 1989 \\
416 Ty Coon, President of Vice
417 \end{quote}
420 This General Public License does not permit incorporating your program
421 into proprietary programs. If your program is a subroutine library, you
422 may consider it more useful to permit linking proprietary applications
423 with the library. If this is what you want to do, use the GNU Library
424 General Public License instead of this License.
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