1 GNU General Public License
2 ==========================
5 _Copyright © 1989, 1991 Free Software Foundation, Inc.,_
6 _51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA_
8 Everyone is permitted to copy and distribute verbatim copies
9 of this license document, but changing it is not allowed.
13 The licenses for most software are designed to take away your
14 freedom to share and change it. By contrast, the GNU General Public
15 License is 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 Lesser General Public License instead.) You can apply it to
23 When we speak of free software, we are referring to freedom, not
24 price. Our General Public Licenses are designed to make sure that you
25 have the freedom to distribute copies of free software (and charge for
26 this service if you wish), that you receive source code or can get it
27 if you want it, that you can change the software or use pieces of it
28 in new free programs; and that you know you can do these things.
30 To protect your rights, we need to make restrictions that forbid
31 anyone to deny you these rights or to ask you to surrender the rights.
32 These restrictions translate to certain responsibilities for you if you
33 distribute copies of the software, or if you modify it.
35 For example, if you distribute copies of such a program, whether
36 gratis or for a fee, you must give the recipients all the rights that
37 you have. You must make sure that they, too, receive or can get the
38 source code. And you must show them these terms so they know their
41 We protect your rights with two steps: **(1)** copyright the software, and
42 **(2)** offer you this license which gives you legal permission to copy,
43 distribute and/or modify the software.
45 Also, for each author's protection and ours, we want to make certain
46 that everyone understands that there is no warranty for this free
47 software. If the software is modified by someone else and passed on, we
48 want its recipients to know that what they have is not the original, so
49 that any problems introduced by others will not reflect on the original
52 Finally, any free program is threatened constantly by software
53 patents. We wish to avoid the danger that redistributors of a free
54 program will individually obtain patent licenses, in effect making the
55 program proprietary. To prevent this, we have made it clear that any
56 patent must be licensed for everyone's free use or not licensed at all.
58 The precise terms and conditions for copying, distribution and
61 ### TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
63 **0.** This License applies to any program or other work which contains
64 a notice placed by the copyright holder saying it may be distributed
65 under the terms of this General Public License. The “Program”, below,
66 refers to any such program or work, and a “work based on the Program”
67 means either the Program or any derivative work under copyright law:
68 that is to say, a work containing the Program or a portion of it,
69 either verbatim or with modifications and/or translated into another
70 language. (Hereinafter, translation is included without limitation in
71 the term “modification”.) Each licensee is addressed as “you”.
73 Activities other than copying, distribution and modification are not
74 covered by this License; they are outside its scope. The act of
75 running the Program is not restricted, and the output from the Program
76 is covered only if its contents constitute a work based on the
77 Program (independent of having been made by running the Program).
78 Whether that is true depends on what the Program does.
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 warranty;
85 and give any other recipients of the Program a copy of this License
86 along with the Program.
88 You may charge a fee for the physical act of transferring a copy, and
89 you may at your option offer warranty protection in exchange for a fee.
91 **2.** You may modify your copy or copies of the Program or any portion
92 of it, thus forming a work based on the Program, and copy and
93 distribute such modifications or work under the terms of Section 1
94 above, provided that you also meet all of these conditions:
96 * **a)** You must cause the modified files to carry prominent notices
97 stating that you changed the files and the date of any change.
98 * **b)** You must cause any work that you distribute or publish, that in
99 whole or in part contains or is derived from the Program or any
100 part thereof, to be licensed as a whole at no charge to all third
101 parties under the terms of this License.
102 * **c)** If the modified program normally reads commands interactively
103 when run, you must cause it, when started running for such
104 interactive use in the most ordinary way, to print or display an
105 announcement including an appropriate copyright notice and a
106 notice that there is no warranty (or else, saying that you provide
107 a warranty) and that users may redistribute the program under
108 these conditions, and telling the user how to view a copy of this
109 License. (Exception: if the Program itself is interactive but
110 does not normally print such an announcement, your work based on
111 the Program is not required to print an announcement.)
113 These requirements apply to the modified work as a whole. If
114 identifiable sections of that work are not derived from the Program,
115 and can be reasonably considered independent and separate works in
116 themselves, then this License, and its terms, do not apply to those
117 sections when you distribute them as separate works. But when you
118 distribute the same sections as part of a whole which is a work based
119 on the Program, the distribution of the whole must be on the terms of
120 this License, whose permissions for other licensees extend to the
121 entire whole, and thus to each and every part regardless of who wrote it.
123 Thus, it is not the intent of this section to claim rights or contest
124 your rights to work written entirely by you; rather, the intent is to
125 exercise the right to control the distribution of derivative or
126 collective works based on the Program.
128 In addition, mere aggregation of another work not based on the Program
129 with the Program (or with a work based on the Program) on a volume of
130 a storage or distribution medium does not bring the other work under
131 the scope of this License.
133 **3.** You may copy and distribute the Program (or a work based on it,
134 under Section 2) in object code or executable form under the terms of
135 Sections 1 and 2 above provided that you also do one of the following:
137 * **a)** Accompany it with the complete corresponding machine-readable
138 source code, which must be distributed under the terms of Sections
139 1 and 2 above on a medium customarily used for software interchange; or,
140 * **b)** Accompany it with a written offer, valid for at least three
141 years, to give any third party, for a charge no more than your
142 cost of physically performing source distribution, a complete
143 machine-readable copy of the corresponding source code, to be
144 distributed under the terms of Sections 1 and 2 above on a medium
145 customarily used for software interchange; or,
146 * **c)** Accompany it with the information you received as to the offer
147 to distribute corresponding source code. (This alternative is
148 allowed only for noncommercial distribution and only if you
149 received the program in object code or executable form with such
150 an offer, in accord with Subsection b above.)
152 The source code for a work means the preferred form of the work for
153 making modifications to it. For an executable work, complete source
154 code means all the source code for all modules it contains, plus any
155 associated interface definition files, plus the scripts used to
156 control compilation and installation of the executable. However, as a
157 special exception, the source code distributed need not include
158 anything that is normally distributed (in either source or binary
159 form) with the major components (compiler, kernel, and so on) of the
160 operating system on which the executable runs, unless that component
161 itself accompanies the executable.
163 If distribution of executable or object code is made by offering
164 access to copy from a designated place, then offering equivalent
165 access to copy the source code from the same place counts as
166 distribution of the source code, even though third parties are not
167 compelled to copy the source along with the object code.
169 **4.** You may not copy, modify, sublicense, or distribute the Program
170 except as expressly provided under this License. Any attempt
171 otherwise to copy, modify, sublicense or distribute the Program is
172 void, and will automatically terminate your rights under this License.
173 However, parties who have received copies, or rights, from you under
174 this License will not have their licenses terminated so long as such
175 parties remain in full compliance.
177 **5.** You are not required to accept this License, since you have not
178 signed it. However, nothing else grants you permission to modify or
179 distribute the Program or its derivative works. These actions are
180 prohibited by law if you do not accept this License. Therefore, by
181 modifying or distributing the Program (or any work based on the
182 Program), you indicate your acceptance of this License to do so, and
183 all its terms and conditions for copying, distributing or modifying
184 the Program or works based on it.
186 **6.** Each time you redistribute the Program (or any work based on the
187 Program), the recipient automatically receives a license from the
188 original licensor to copy, distribute or modify the Program subject to
189 these terms and conditions. You may not impose any further
190 restrictions on the recipients' exercise of the rights granted herein.
191 You are not responsible for enforcing compliance by third parties to
194 **7.** If, as a consequence of a court judgment or allegation of patent
195 infringement or for any other reason (not limited to patent issues),
196 conditions are imposed on you (whether by court order, agreement or
197 otherwise) that contradict the conditions of this License, they do not
198 excuse you from the conditions of this License. If you cannot
199 distribute so as to satisfy simultaneously your obligations under this
200 License and any other pertinent obligations, then as a consequence you
201 may not distribute the Program at all. For example, if a patent
202 license would not permit royalty-free redistribution of the Program by
203 all those who receive copies directly or indirectly through you, then
204 the only way you could satisfy both it and this License would be to
205 refrain entirely from distribution of the Program.
207 If any portion of this section is held invalid or unenforceable under
208 any particular circumstance, the balance of the section is intended to
209 apply and the section as a whole is intended to apply in other
212 It is not the purpose of this section to induce you to infringe any
213 patents or other property right claims or to contest validity of any
214 such claims; this section has the sole purpose of protecting the
215 integrity of the free software distribution system, which is
216 implemented by public license practices. Many people have made
217 generous contributions to the wide range of software distributed
218 through that system in reliance on consistent application of that
219 system; it is up to the author/donor to decide if he or she is willing
220 to distribute software through any other system and a licensee cannot
223 This section is intended to make thoroughly clear what is believed to
224 be a consequence of the rest of this License.
226 **8.** If the distribution and/or use of the Program is restricted in
227 certain countries either by patents or by copyrighted interfaces, the
228 original copyright holder who places the Program under this License
229 may add an explicit geographical distribution limitation excluding
230 those countries, so that distribution is permitted only in or among
231 countries not thus excluded. In such case, this License incorporates
232 the limitation as if written in the body of this License.
234 **9.** The Free Software Foundation may publish revised and/or new versions
235 of the General Public License from time to time. Such new versions will
236 be similar in spirit to the present version, but may differ in detail to
237 address new problems or concerns.
239 Each version is given a distinguishing version number. If the Program
240 specifies a version number of this License which applies to it and “any
241 later version”, you have the option of following the terms and conditions
242 either of that version or of any later version published by the Free
243 Software Foundation. If the Program does not specify a version number of
244 this License, you may choose any version ever published by the Free Software
247 **10.** If you wish to incorporate parts of the Program into other free
248 programs whose distribution conditions are different, write to the author
249 to ask for permission. For software which is copyrighted by the Free
250 Software Foundation, write to the Free Software Foundation; we sometimes
251 make exceptions for this. Our decision will be guided by the two goals
252 of preserving the free status of all derivatives of our free software and
253 of promoting the sharing and reuse of software generally.
257 **11.** BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
258 FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN
259 OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
260 PROVIDE THE PROGRAM “AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
261 OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
262 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS
263 TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE
264 PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
265 REPAIR OR CORRECTION.
267 **12.** IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
268 WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
269 REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
270 INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
271 OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
272 TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
273 YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
274 PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
275 POSSIBILITY OF SUCH DAMAGES.
277 END OF TERMS AND CONDITIONS
279 ### How to Apply These Terms to Your New Programs
281 If you develop a new program, and you want it to be of the greatest
282 possible use to the public, the best way to achieve this is to make it
283 free software which everyone can redistribute and change under these terms.
285 To do so, attach the following notices to the program. It is safest
286 to attach them to the start of each source file to most effectively
287 convey the exclusion of warranty; and each file should have at least
288 the “copyright” line and a pointer to where the full notice is found.
290 <one line to give the program's name and a brief idea of what it does.>
291 Copyright (C) <year> <name of author>
293 This program is free software; you can redistribute it and/or modify
294 it under the terms of the GNU General Public License as published by
295 the Free Software Foundation; either version 2 of the License, or
296 (at your option) any later version.
298 This program is distributed in the hope that it will be useful,
299 but WITHOUT ANY WARRANTY; without even the implied warranty of
300 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
301 GNU General Public License for more details.
303 You should have received a copy of the GNU General Public License along
304 with this program; if not, write to the Free Software Foundation, Inc.,
305 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
307 Also add information on how to contact you by electronic and paper mail.
309 If the program is interactive, make it output a short notice like this
310 when it starts in an interactive mode:
312 Gnomovision version 69, Copyright (C) year name of author
313 Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
314 This is free software, and you are welcome to redistribute it
315 under certain conditions; type `show c' for details.
317 The hypothetical commands `show w` and `show c` should show the appropriate
318 parts of the General Public License. Of course, the commands you use may
319 be called something other than `show w' and `show c`; they could even be
320 mouse-clicks or menu items--whatever suits your program.
322 You should also get your employer (if you work as a programmer) or your
323 school, if any, to sign a “copyright disclaimer” for the program, if
324 necessary. Here is a sample; alter the names:
326 Yoyodyne, Inc., hereby disclaims all copyright interest in the program
327 `Gnomovision' (which makes passes at compilers) written by James Hacker.
329 <signature of Ty Coon>, 1 April 1989
330 Ty Coon, President of Vice
332 This General Public License does not permit incorporating your program into
333 proprietary programs. If your program is a subroutine library, you may
334 consider it more useful to permit linking proprietary applications with the
335 library. If this is what you want to do, use the GNU Lesser General
336 Public License instead of this License.