1 scripts.mit.edu repository
2 Copyright (C) 2006 Jeff Arnold and Joe Presbrey,
5 These programs are free software; you can redistribute them and/or
6 modify them under the terms of the GNU General Public License
7 as published by the Free Software Foundation; either version 2
8 of the License, or (at your option) any later version.
10 These programs are distributed in the hope that they will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
19 GNU GENERAL PUBLIC LICENSE
22 Copyright (C) 1989, 1991 Free Software Foundation, Inc.
23 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
24 Everyone is permitted to copy and distribute verbatim copies
25 of this license document, but changing it is not allowed.
29 The licenses for most software are designed to take away your
30 freedom to share and change it. By contrast, the GNU General Public
31 License is intended to guarantee your freedom to share and change free
32 software--to make sure the software is free for all its users. This
33 General Public License applies to most of the Free Software
34 Foundation's software and to any other program whose authors commit to
35 using it. (Some other Free Software Foundation software is covered by
36 the GNU Library General Public License instead.) You can apply it to
39 When we speak of free software, we are referring to freedom, not
40 price. Our General Public Licenses are designed to make sure that you
41 have the freedom to distribute copies of free software (and charge for
42 this service if you wish), that you receive source code or can get it
43 if you want it, that you can change the software or use pieces of it
44 in new free programs; and that you know you can do these things.
46 To protect your rights, we need to make restrictions that forbid
47 anyone to deny you these rights or to ask you to surrender the rights.
48 These restrictions translate to certain responsibilities for you if you
49 distribute copies of the software, or if you modify it.
51 For example, if you distribute copies of such a program, whether
52 gratis or for a fee, you must give the recipients all the rights that
53 you have. You must make sure that they, too, receive or can get the
54 source code. And you must show them these terms so they know their
57 We protect your rights with two steps: (1) copyright the software, and
58 (2) offer you this license which gives you legal permission to copy,
59 distribute and/or modify the software.
61 Also, for each author's protection and ours, we want to make certain
62 that everyone understands that there is no warranty for this free
63 software. If the software is modified by someone else and passed on, we
64 want its recipients to know that what they have is not the original, so
65 that any problems introduced by others will not reflect on the original
68 Finally, any free program is threatened constantly by software
69 patents. We wish to avoid the danger that redistributors of a free
70 program will individually obtain patent licenses, in effect making the
71 program proprietary. To prevent this, we have made it clear that any
72 patent must be licensed for everyone's free use or not licensed at all.
74 The precise terms and conditions for copying, distribution and
77 GNU GENERAL PUBLIC LICENSE
78 TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
80 0. This License applies to any program or other work which contains
81 a notice placed by the copyright holder saying it may be distributed
82 under the terms of this General Public License. The "Program", below,
83 refers to any such program or work, and a "work based on the Program"
84 means either the Program or any derivative work under copyright law:
85 that is to say, a work containing the Program or a portion of it,
86 either verbatim or with modifications and/or translated into another
87 language. (Hereinafter, translation is included without limitation in
88 the term "modification".) Each licensee is addressed as "you".
90 Activities other than copying, distribution and modification are not
91 covered by this License; they are outside its scope. The act of
92 running the Program is not restricted, and the output from the Program
93 is covered only if its contents constitute a work based on the
94 Program (independent of having been made by running the Program).
95 Whether that is true depends on what the Program does.
97 1. You may copy and distribute verbatim copies of the Program's
98 source code as you receive it, in any medium, provided that you
99 conspicuously and appropriately publish on each copy an appropriate
100 copyright notice and disclaimer of warranty; keep intact all the
101 notices that refer to this License and to the absence of any warranty;
102 and give any other recipients of the Program a copy of this License
103 along with the Program.
105 You may charge a fee for the physical act of transferring a copy, and
106 you may at your option offer warranty protection in exchange for a fee.
108 2. You may modify your copy or copies of the Program or any portion
109 of it, thus forming a work based on the Program, and copy and
110 distribute such modifications or work under the terms of Section 1
111 above, provided that you also meet all of these conditions:
113 a) You must cause the modified files to carry prominent notices
114 stating that you changed the files and the date of any change.
116 b) You must cause any work that you distribute or publish, that in
117 whole or in part contains or is derived from the Program or any
118 part thereof, to be licensed as a whole at no charge to all third
119 parties under the terms of this License.
121 c) If the modified program normally reads commands interactively
122 when run, you must cause it, when started running for such
123 interactive use in the most ordinary way, to print or display an
124 announcement including an appropriate copyright notice and a
125 notice that there is no warranty (or else, saying that you provide
126 a warranty) and that users may redistribute the program under
127 these conditions, and telling the user how to view a copy of this
128 License. (Exception: if the Program itself is interactive but
129 does not normally print such an announcement, your work based on
130 the Program is not required to print an announcement.)
132 These requirements apply to the modified work as a whole. If
133 identifiable sections of that work are not derived from the Program,
134 and can be reasonably considered independent and separate works in
135 themselves, then this License, and its terms, do not apply to those
136 sections when you distribute them as separate works. But when you
137 distribute the same sections as part of a whole which is a work based
138 on the Program, the distribution of the whole must be on the terms of
139 this License, whose permissions for other licensees extend to the
140 entire whole, and thus to each and every part regardless of who wrote it.
142 Thus, it is not the intent of this section to claim rights or contest
143 your rights to work written entirely by you; rather, the intent is to
144 exercise the right to control the distribution of derivative or
145 collective works based on the Program.
147 In addition, mere aggregation of another work not based on the Program
148 with the Program (or with a work based on the Program) on a volume of
149 a storage or distribution medium does not bring the other work under
150 the scope of this License.
152 3. You may copy and distribute the Program (or a work based on it,
153 under Section 2) in object code or executable form under the terms of
154 Sections 1 and 2 above provided that you also do one of the following:
156 a) Accompany it with the complete corresponding machine-readable
157 source code, which must be distributed under the terms of Sections
158 1 and 2 above on a medium customarily used for software interchange; or,
160 b) Accompany it with a written offer, valid for at least three
161 years, to give any third party, for a charge no more than your
162 cost of physically performing source distribution, a complete
163 machine-readable copy of the corresponding source code, to be
164 distributed under the terms of Sections 1 and 2 above on a medium
165 customarily used for software interchange; or,
167 c) Accompany it with the information you received as to the offer
168 to distribute corresponding source code. (This alternative is
169 allowed only for noncommercial distribution and only if you
170 received the program in object code or executable form with such
171 an offer, in accord with Subsection b above.)
173 The source code for a work means the preferred form of the work for
174 making modifications to it. For an executable work, complete source
175 code means all the source code for all modules it contains, plus any
176 associated interface definition files, plus the scripts used to
177 control compilation and installation of the executable. However, as a
178 special exception, the source code distributed need not include
179 anything that is normally distributed (in either source or binary
180 form) with the major components (compiler, kernel, and so on) of the
181 operating system on which the executable runs, unless that component
182 itself accompanies the executable.
184 If distribution of executable or object code is made by offering
185 access to copy from a designated place, then offering equivalent
186 access to copy the source code from the same place counts as
187 distribution of the source code, even though third parties are not
188 compelled to copy the source along with the object code.
190 4. You may not copy, modify, sublicense, or distribute the Program
191 except as expressly provided under this License. Any attempt
192 otherwise to copy, modify, sublicense or distribute the Program is
193 void, and will automatically terminate your rights under this License.
194 However, parties who have received copies, or rights, from you under
195 this License will not have their licenses terminated so long as such
196 parties remain in full compliance.
198 5. You are not required to accept this License, since you have not
199 signed it. However, nothing else grants you permission to modify or
200 distribute the Program or its derivative works. These actions are
201 prohibited by law if you do not accept this License. Therefore, by
202 modifying or distributing the Program (or any work based on the
203 Program), you indicate your acceptance of this License to do so, and
204 all its terms and conditions for copying, distributing or modifying
205 the Program or works based on it.
207 6. Each time you redistribute the Program (or any work based on the
208 Program), the recipient automatically receives a license from the
209 original licensor to copy, distribute or modify the Program subject to
210 these terms and conditions. You may not impose any further
211 restrictions on the recipients' exercise of the rights granted herein.
212 You are not responsible for enforcing compliance by third parties to
215 7. If, as a consequence of a court judgment or allegation of patent
216 infringement or for any other reason (not limited to patent issues),
217 conditions are imposed on you (whether by court order, agreement or
218 otherwise) that contradict the conditions of this License, they do not
219 excuse you from the conditions of this License. If you cannot
220 distribute so as to satisfy simultaneously your obligations under this
221 License and any other pertinent obligations, then as a consequence you
222 may not distribute the Program at all. For example, if a patent
223 license would not permit royalty-free redistribution of the Program by
224 all those who receive copies directly or indirectly through you, then
225 the only way you could satisfy both it and this License would be to
226 refrain entirely from distribution of the Program.
228 If any portion of this section is held invalid or unenforceable under
229 any particular circumstance, the balance of the section is intended to
230 apply and the section as a whole is intended to apply in other
233 It is not the purpose of this section to induce you to infringe any
234 patents or other property right claims or to contest validity of any
235 such claims; this section has the sole purpose of protecting the
236 integrity of the free software distribution system, which is
237 implemented by public license practices. Many people have made
238 generous contributions to the wide range of software distributed
239 through that system in reliance on consistent application of that
240 system; it is up to the author/donor to decide if he or she is willing
241 to distribute software through any other system and a licensee cannot
244 This section is intended to make thoroughly clear what is believed to
245 be a consequence of the rest of this License.
247 8. If the distribution and/or use of the Program is restricted in
248 certain countries either by patents or by copyrighted interfaces, the
249 original copyright holder who places the Program under this License
250 may add an explicit geographical distribution limitation excluding
251 those countries, so that distribution is permitted only in or among
252 countries not thus excluded. In such case, this License incorporates
253 the limitation as if written in the body of this License.
255 9. The Free Software Foundation may publish revised and/or new versions
256 of the General Public License from time to time. Such new versions will
257 be similar in spirit to the present version, but may differ in detail to
258 address new problems or concerns.
260 Each version is given a distinguishing version number. If the Program
261 specifies a version number of this License which applies to it and "any
262 later version", you have the option of following the terms and conditions
263 either of that version or of any later version published by the Free
264 Software Foundation. If the Program does not specify a version number of
265 this License, you may choose any version ever published by the Free Software
268 10. If you wish to incorporate parts of the Program into other free
269 programs whose distribution conditions are different, write to the author
270 to ask for permission. For software which is copyrighted by the Free
271 Software Foundation, write to the Free Software Foundation; we sometimes
272 make exceptions for this. Our decision will be guided by the two goals
273 of preserving the free status of all derivatives of our free software and
274 of promoting the sharing and reuse of software generally.
278 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
279 FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN
280 OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
281 PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
282 OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
283 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS
284 TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE
285 PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
286 REPAIR OR CORRECTION.
288 12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
289 WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
290 REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
291 INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
292 OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
293 TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
294 YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
295 PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
296 POSSIBILITY OF SUCH DAMAGES.
298 END OF TERMS AND CONDITIONS
300 How to Apply These Terms to Your New Programs
302 If you develop a new program, and you want it to be of the greatest
303 possible use to the public, the best way to achieve this is to make it
304 free software which everyone can redistribute and change under these terms.
306 To do so, attach the following notices to the program. It is safest
307 to attach them to the start of each source file to most effectively
308 convey the exclusion of warranty; and each file should have at least
309 the "copyright" line and a pointer to where the full notice is found.
311 <one line to give the program's name and a brief idea of what it does.>
312 Copyright (C) <year> <name of author>
314 This program is free software; you can redistribute it and/or modify
315 it under the terms of the GNU General Public License as published by
316 the Free Software Foundation; either version 2 of the License, or
317 (at your option) any later version.
319 This program is distributed in the hope that it will be useful,
320 but WITHOUT ANY WARRANTY; without even the implied warranty of
321 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
322 GNU General Public License for more details.
324 You should have received a copy of the GNU General Public License
325 along with this program; if not, write to the Free Software
326 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
329 Also add information on how to contact you by electronic and paper mail.
331 If the program is interactive, make it output a short notice like this
332 when it starts in an interactive mode:
334 Gnomovision version 69, Copyright (C) year name of author
335 Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
336 This is free software, and you are welcome to redistribute it
337 under certain conditions; type `show c' for details.
339 The hypothetical commands `show w' and `show c' should show the appropriate
340 parts of the General Public License. Of course, the commands you use may
341 be called something other than `show w' and `show c'; they could even be
342 mouse-clicks or menu items--whatever suits your program.
344 You should also get your employer (if you work as a programmer) or your
345 school, if any, to sign a "copyright disclaimer" for the program, if
346 necessary. Here is a sample; alter the names:
348 Yoyodyne, Inc., hereby disclaims all copyright interest in the program
349 `Gnomovision' (which makes passes at compilers) written by James Hacker.
351 <signature of Ty Coon>, 1 April 1989
352 Ty Coon, President of Vice
354 This General Public License does not permit incorporating your program into
355 proprietary programs. If your program is a subroutine library, you may
356 consider it more useful to permit linking proprietary applications with the
357 library. If this is what you want to do, use the GNU Lesser General
358 Public License instead of this License.