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1 GNU GENERAL PUBLIC LICENSE
2 Version 2, June 1991
3
4 Copyright (C) 1989, 1991 Free Software Foundation, Inc.
5 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
6
7 Everyone is permitted to copy and distribute verbatim copies
8 of this license document, but changing it is not allowed.
9
10 Preamble
11 ========
12
13 The licenses for most software are designed to take away your freedom
14 to share and change it. By contrast, the GNU General Public License is
15 intended to guarantee your freedom to share and change free
16 software--to make sure the software is free for all its users. This
17 General Public License applies to most of the Free Software
18 Foundation's software and to any other program whose authors commit to
19 using it. (Some other Free Software Foundation software is covered by
20 the GNU Library General Public License instead.) You can apply it to
21 your programs, too.
22
23 When we speak of free software, we are referring to freedom, not price.
24 Our General Public Licenses are designed to make sure that you have
25 the freedom to distribute copies of free software (and charge for this
26 service if you wish), that you receive source code or can get it if you
27 want it, that you can change the software or use pieces of it in new
28 free programs; and that you know you can do these things.
29
30 To protect your rights, we need to make restrictions that forbid anyone
31 to deny you these rights or to ask you to surrender the rights. These
32 restrictions translate to certain responsibilities for you if you
33 distribute copies of the software, or if you modify it.
34
35 For example, if you distribute copies of such a program, whether gratis
36 or for a fee, you must give the recipients all the rights that you
37 have. You must make sure that they, too, receive or can get the source
38 code. And you must show them these terms so they know their rights.
39
40 We protect your rights with two steps: (1) copyright the software, and
41 (2) offer you this license which gives you legal permission to copy,
42 distribute and/or modify the software.
43
44 Also, for each author's protection and ours, we want to make certain
45 that everyone understands that there is no warranty for this free
46 software. If the software is modified by someone else and passed on, we
47 want its recipients to know that what they have is not the original, so
48 that any problems introduced by others will not reflect on the original
49 authors' reputations.
50
51 Finally, any free program is threatened constantly by software patents.
52 We wish to avoid the danger that redistributors of a free program will
53 individually obtain patent licenses, in effect making the program
54 proprietary. To prevent this, we have made it clear that any patent
55 must be licensed for everyone's free use or not licensed at all.
56
57 The precise terms and conditions for copying, distribution and
58 modification follow.
59
60 GNU GENERAL PUBLIC LICENSE
61 TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
62 0. This License applies to any program or other work which contains a
63 notice placed by the copyright holder saying it may be distributed
64 under the terms of this General Public License. The "Program",
65 below, refers to any such program or work, and a "work based on
66 the Program" means either the Program or any derivative work under
67 copyright law: that is to say, a work containing the Program or a
68 portion of it, either verbatim or with modifications and/or
69 translated into another language. (Hereinafter, translation is
70 included without limitation in the term "modification".) Each
71 licensee is addressed as "you".
72
73 Activities other than copying, distribution and modification are
74 not covered by this License; they are outside its scope. The act
75 of running the Program is not restricted, and the output from the
76 Program is covered only if its contents constitute a work based on
77 the Program (independent of having been made by running the
78 Program). Whether that is true depends on what the Program does.
79
80 1. You may copy and distribute verbatim copies of the Program's
81 source code as you receive it, in any medium, provided that you
82 conspicuously and appropriately publish on each copy an appropriate
83 copyright notice and disclaimer of warranty; keep intact all the
84 notices that refer to this License and to the absence of any
85 warranty; and give any other recipients of the Program a copy of
86 this License along with the Program.
87
88 You may charge a fee for the physical act of transferring a copy,
89 and you may at your option offer warranty protection in exchange
90 for a fee.
91
92 2. You may modify your copy or copies of the Program or any portion
93 of it, thus forming a work based on the Program, and copy and
94 distribute such modifications or work under the terms of Section 1
95 above, provided that you also meet all of these conditions:
96
97 a. You must cause the modified files to carry prominent notices
98 stating that you changed the files and the date of any change.
99
100 b. You must cause any work that you distribute or publish, that
101 in whole or in part contains or is derived from the Program
102 or any part thereof, to be licensed as a whole at no charge
103 to all third parties under the terms of this License.
104
105 c. If the modified program normally reads commands interactively
106 when run, you must cause it, when started running for such
107 interactive use in the most ordinary way, to print or display
108 an announcement including an appropriate copyright notice and
109 a notice that there is no warranty (or else, saying that you
110 provide a warranty) and that users may redistribute the
111 program under these conditions, and telling the user how to
112 view a copy of this License. (Exception: if the Program
113 itself is interactive but does not normally print such an
114 announcement, your work based on the Program is not required
115 to print an announcement.)
116
117 These requirements apply to the modified work as a whole. If
118 identifiable sections of that work are not derived from the
119 Program, and can be reasonably considered independent and separate
120 works in themselves, then this License, and its terms, do not
121 apply to those sections when you distribute them as separate
122 works. But when you distribute the same sections as part of a
123 whole which is a work based on the Program, the distribution of
124 the whole must be on the terms of this License, whose permissions
125 for other licensees extend to the entire whole, and thus to each
126 and every part regardless of who wrote it.
127
128 Thus, it is not the intent of this section to claim rights or
129 contest your rights to work written entirely by you; rather, the
130 intent is to exercise the right to control the distribution of
131 derivative or collective works based on the Program.
132
133 In addition, mere aggregation of another work not based on the
134 Program with the Program (or with a work based on the Program) on
135 a volume of a storage or distribution medium does not bring the
136 other work under the scope of this License.
137
138 3. You may copy and distribute the Program (or a work based on it,
139 under Section 2) in object code or executable form under the terms
140 of Sections 1 and 2 above provided that you also do one of the
141 following:
142
143 a. Accompany it with the complete corresponding machine-readable
144 source code, which must be distributed under the terms of
145 Sections 1 and 2 above on a medium customarily used for
146 software interchange; or,
147
148 b. Accompany it with a written offer, valid for at least three
149 years, to give any third-party, for a charge no more than your
150 cost of physically performing source distribution, a complete
151 machine-readable copy of the corresponding source code, to be
152 distributed under the terms of Sections 1 and 2 above on a
153 medium customarily used for software interchange; or,
154
155 c. Accompany it with the information you received as to the offer
156 to distribute corresponding source code. (This alternative is
157 allowed only for noncommercial distribution and only if you
158 received the program in object code or executable form with
159 such an offer, in accord with Subsection b above.)
160
161 The source code for a work means the preferred form of the work for
162 making modifications to it. For an executable work, complete
163 source code means all the source code for all modules it contains,
164 plus any associated interface definition files, plus the scripts
165 used to control compilation and installation of the executable.
166 However, as a special exception, the source code distributed need
167 not include anything that is normally distributed (in either
168 source or binary form) with the major components (compiler,
169 kernel, and so on) of the operating system on which the executable
170 runs, unless that component itself accompanies the executable.
171
172 If distribution of executable or object code is made by offering
173 access to copy from a designated place, then offering equivalent
174 access to copy the source code from the same place counts as
175 distribution of the source code, even though third parties are not
176 compelled to copy the source along with the object code.
177
178 4. You may not copy, modify, sublicense, or distribute the Program
179 except as expressly provided under this License. Any attempt
180 otherwise to copy, modify, sublicense or distribute the Program is
181 void, and will automatically terminate your rights under this
182 License. However, parties who have received copies, or rights,
183 from you under this License will not have their licenses
184 terminated so long as such parties remain in full compliance.
185
186 5. You are not required to accept this License, since you have not
187 signed it. However, nothing else grants you permission to modify
188 or distribute the Program or its derivative works. These actions
189 are prohibited by law if you do not accept this License.
190 Therefore, by modifying or distributing the Program (or any work
191 based on the Program), you indicate your acceptance of this
192 License to do so, and all its terms and conditions for copying,
193 distributing or modifying the Program or works based on it.
194
195 6. Each time you redistribute the Program (or any work based on the
196 Program), the recipient automatically receives a license from the
197 original licensor to copy, distribute or modify the Program
198 subject to these terms and conditions. You may not impose any
199 further restrictions on the recipients' exercise of the rights
200 granted herein. You are not responsible for enforcing compliance
201 by third parties to this License.
202
203 7. If, as a consequence of a court judgment or allegation of patent
204 infringement or for any other reason (not limited to patent
205 issues), conditions are imposed on you (whether by court order,
206 agreement or otherwise) that contradict the conditions of this
207 License, they do not excuse you from the conditions of this
208 License. If you cannot distribute so as to satisfy simultaneously
209 your obligations under this License and any other pertinent
210 obligations, then as a consequence you may not distribute the
211 Program at all. For example, if a patent license would not permit
212 royalty-free redistribution of the Program by all those who
213 receive copies directly or indirectly through you, then the only
214 way you could satisfy both it and this License would be to refrain
215 entirely from distribution of the Program.
216
217 If any portion of this section is held invalid or unenforceable
218 under any particular circumstance, the balance of the section is
219 intended to apply and the section as a whole is intended to apply
220 in other circumstances.
221
222 It is not the purpose of this section to induce you to infringe any
223 patents or other property right claims or to contest validity of
224 any such claims; this section has the sole purpose of protecting
225 the integrity of the free software distribution system, which is
226 implemented by public license practices. Many people have made
227 generous contributions to the wide range of software distributed
228 through that system in reliance on consistent application of that
229 system; it is up to the author/donor to decide if he or she is
230 willing to distribute software through any other system and a
231 licensee cannot impose that choice.
232
233 This section is intended to make thoroughly clear what is believed
234 to be a consequence of the rest of this License.
235
236 8. If the distribution and/or use of the Program is restricted in
237 certain countries either by patents or by copyrighted interfaces,
238 the original copyright holder who places the Program under this
239 License may add an explicit geographical distribution limitation
240 excluding those countries, so that distribution is permitted only
241 in or among countries not thus excluded. In such case, this
242 License incorporates the limitation as if written in the body of
243 this License.
244
245 9. The Free Software Foundation may publish revised and/or new
246 versions of the General Public License from time to time. Such
247 new versions will be similar in spirit to the present version, but
248 may differ in detail to address new problems or concerns.
249
250 Each version is given a distinguishing version number. If the
251 Program specifies a version number of this License which applies
252 to it and "any later version", you have the option of following
253 the terms and conditions either of that version or of any later
254 version published by the Free Software Foundation. If the Program
255 does not specify a version number of this License, you may choose
256 any version ever published by the Free Software Foundation.
257
258 10. If you wish to incorporate parts of the Program into other free
259 programs whose distribution conditions are different, write to the
260 author to ask for permission. For software which is copyrighted
261 by the Free Software Foundation, write to the Free Software
262 Foundation; we sometimes make exceptions for this. Our decision
263 will be guided by the two goals of preserving the free status of
264 all derivatives of our free software and of promoting the sharing
265 and reuse of software generally.
266
267 NO WARRANTY
268 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO
269 WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE
270 LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
271 HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT
272 WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT
273 NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
274 FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE
275 QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE
276 PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY
277 SERVICING, REPAIR OR CORRECTION.
278
279 12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN
280 WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY
281 MODIFY AND/OR REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE
282 LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL,
283 INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR
284 INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
285 DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU
286 OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY
287 OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN
288 ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
289
290 END OF TERMS AND CONDITIONS
291 How to Apply These Terms to Your New Programs
292 =============================================
293
294 If you develop a new program, and you want it to be of the greatest
295 possible use to the public, the best way to achieve this is to make it
296 free software which everyone can redistribute and change under these
297 terms.
298
299 To do so, attach the following notices to the program. It is safest to
300 attach them to the start of each source file to most effectively convey
301 the exclusion of warranty; and each file should have at least the
302 "copyright" line and a pointer to where the full notice is found.
303
304 ONE LINE TO GIVE THE PROGRAM'S NAME AND A BRIEF IDEA OF WHAT IT DOES.
305 Copyright (C) YYYY NAME OF AUTHOR
306
307 This program is free software; you can redistribute it and/or modify
308 it under the terms of the GNU General Public License as published by
309 the Free Software Foundation; either version 2 of the License, or
310 (at your option) any later version.
311
312 This program is distributed in the hope that it will be useful,
313 but WITHOUT ANY WARRANTY; without even the implied warranty of
314 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
315 GNU General Public License for more details.
316
317 You should have received a copy of the GNU General Public License
318 along with this program; if not, write to the Free Software
319 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
320
321 Also add information on how to contact you by electronic and paper mail.
322
323 If the program is interactive, make it output a short notice like this
324 when it starts in an interactive mode:
325
326 Gnomovision version 69, Copyright (C) 19YY NAME OF AUTHOR
327 Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
328 This is free software, and you are welcome to redistribute it
329 under certain conditions; type `show c' for details.
330
331 The hypothetical commands `show w' and `show c' should show the
332 appropriate parts of the General Public License. Of course, the
333 commands you use may be called something other than `show w' and `show
334 c'; they could even be mouse-clicks or menu items--whatever suits your
335 program.
336
337 You should also get your employer (if you work as a programmer) or your
338 school, if any, to sign a "copyright disclaimer" for the program, if
339 necessary. Here is a sample; alter the names:
340
341 Yoyodyne, Inc., hereby disclaims all copyright interest in the program
342 `Gnomovision' (which makes passes at compilers) written by James Hacker.
343
344 SIGNATURE OF TY COON, 1 April 1989
345 Ty Coon, President of Vice
346
347 This General Public License does not permit incorporating your program
348 into proprietary programs. If your program is a subroutine library,
349 you may consider it more useful to permit linking proprietary
350 applications with the library. If this is what you want to do, use the
351 GNU Library General Public License instead of this License.
352