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1 Maxima is dedicated to the memory of William F. Schelter. On 6 October
2 1998 William F. Schelter was formally notified that he could distribute
3 DOE-MACSYMA upon terms of his choosing, in particular the GNU General
4 Public License:
5 <https://maxima.sourceforge.io/i/maxima-doe-auth.png>
6 Schelter proceeded to distribute derived works under the GPL.
7
8 In the formal notification a request was made that a paragraph "should
9 be included in the GPL and should accompany other modifications,
10 enhancements or derivative works of your program." This paragraph is
11 transcribed below in honor of that request. Like the preamble it does
12 not form part of the license.
13
14 "Distribution of such derivative works is subject to the U.S. Export
15 Administration Regulations (Title 15 CFR 768-799), which implements the
16 Export Administration Act of 1979, as amended, and/or the International
17 Traffic in Arms Regulations, of 12-6-84, (Title 22 CFR 121-130), which
18 implements the Arms Export Control Act (22 U.S.C. 2728) and may require
19 license for export."
20
21 GNU GENERAL PUBLIC LICENSE
22 Version 2, June 1991
23
24 Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
25 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26 Everyone is permitted to copy and distribute verbatim copies
27 of this license document, but changing it is not allowed.
28
29 Preamble
30
31 The licenses for most software are designed to take away your
32 freedom to share and change it. By contrast, the GNU General Public
33 License is intended to guarantee your freedom to share and change free
34 software--to make sure the software is free for all its users. This
35 General Public License applies to most of the Free Software
36 Foundation's software and to any other program whose authors commit to
37 using it. (Some other Free Software Foundation software is covered by
38 the GNU Lesser General Public License instead.) You can apply it to
39 your programs, too.
40
41 When we speak of free software, we are referring to freedom, not
42 price. Our General Public Licenses are designed to make sure that you
43 have the freedom to distribute copies of free software (and charge for
44 this service if you wish), that you receive source code or can get it
45 if you want it, that you can change the software or use pieces of it
46 in new free programs; and that you know you can do these things.
47
48 To protect your rights, we need to make restrictions that forbid
49 anyone to deny you these rights or to ask you to surrender the rights.
50 These restrictions translate to certain responsibilities for you if you
51 distribute copies of the software, or if you modify it.
52
53 For example, if you distribute copies of such a program, whether
54 gratis or for a fee, you must give the recipients all the rights that
55 you have. You must make sure that they, too, receive or can get the
56 source code. And you must show them these terms so they know their
57 rights.
58
59 We protect your rights with two steps: (1) copyright the software, and
60 (2) offer you this license which gives you legal permission to copy,
61 distribute and/or modify the software.
62
63 Also, for each author's protection and ours, we want to make certain
64 that everyone understands that there is no warranty for this free
65 software. If the software is modified by someone else and passed on, we
66 want its recipients to know that what they have is not the original, so
67 that any problems introduced by others will not reflect on the original
68 authors' reputations.
69
70 Finally, any free program is threatened constantly by software
71 patents. We wish to avoid the danger that redistributors of a free
72 program will individually obtain patent licenses, in effect making the
73 program proprietary. To prevent this, we have made it clear that any
74 patent must be licensed for everyone's free use or not licensed at all.
75
76 The precise terms and conditions for copying, distribution and
77 modification follow.
78
79 GNU GENERAL PUBLIC LICENSE
80 TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
81
82 0. This License applies to any program or other work which contains
83 a notice placed by the copyright holder saying it may be distributed
84 under the terms of this General Public License. The "Program", below,
85 refers to any such program or work, and a "work based on the Program"
86 means either the Program or any derivative work under copyright law:
87 that is to say, a work containing the Program or a portion of it,
88 either verbatim or with modifications and/or translated into another
89 language. (Hereinafter, translation is included without limitation in
90 the term "modification".) Each licensee is addressed as "you".
91
92 Activities other than copying, distribution and modification are not
93 covered by this License; they are outside its scope. The act of
94 running the Program is not restricted, and the output from the Program
95 is covered only if its contents constitute a work based on the
96 Program (independent of having been made by running the Program).
97 Whether that is true depends on what the Program does.
98
99 1. You may copy and distribute verbatim copies of the Program's
100 source code as you receive it, in any medium, provided that you
101 conspicuously and appropriately publish on each copy an appropriate
102 copyright notice and disclaimer of warranty; keep intact all the
103 notices that refer to this License and to the absence of any warranty;
104 and give any other recipients of the Program a copy of this License
105 along with the Program.
106
107 You may charge a fee for the physical act of transferring a copy, and
108 you may at your option offer warranty protection in exchange for a fee.
109
110 2. You may modify your copy or copies of the Program or any portion
111 of it, thus forming a work based on the Program, and copy and
112 distribute such modifications or work under the terms of Section 1
113 above, provided that you also meet all of these conditions:
114
115 a) You must cause the modified files to carry prominent notices
116 stating that you changed the files and the date of any change.
117
118 b) You must cause any work that you distribute or publish, that in
119 whole or in part contains or is derived from the Program or any
120 part thereof, to be licensed as a whole at no charge to all third
121 parties under the terms of this License.
122
123 c) If the modified program normally reads commands interactively
124 when run, you must cause it, when started running for such
125 interactive use in the most ordinary way, to print or display an
126 announcement including an appropriate copyright notice and a
127 notice that there is no warranty (or else, saying that you provide
128 a warranty) and that users may redistribute the program under
129 these conditions, and telling the user how to view a copy of this
130 License. (Exception: if the Program itself is interactive but
131 does not normally print such an announcement, your work based on
132 the Program is not required to print an announcement.)
133
134 These requirements apply to the modified work as a whole. If
135 identifiable sections of that work are not derived from the Program,
136 and can be reasonably considered independent and separate works in
137 themselves, then this License, and its terms, do not apply to those
138 sections when you distribute them as separate works. But when you
139 distribute the same sections as part of a whole which is a work based
140 on the Program, the distribution of the whole must be on the terms of
141 this License, whose permissions for other licensees extend to the
142 entire whole, and thus to each and every part regardless of who wrote it.
143
144 Thus, it is not the intent of this section to claim rights or contest
145 your rights to work written entirely by you; rather, the intent is to
146 exercise the right to control the distribution of derivative or
147 collective works based on the Program.
148
149 In addition, mere aggregation of another work not based on the Program
150 with the Program (or with a work based on the Program) on a volume of
151 a storage or distribution medium does not bring the other work under
152 the scope of this License.
153
154 3. You may copy and distribute the Program (or a work based on it,
155 under Section 2) in object code or executable form under the terms of
156 Sections 1 and 2 above provided that you also do one of the following:
157
158 a) Accompany it with the complete corresponding machine-readable
159 source code, which must be distributed under the terms of Sections
160 1 and 2 above on a medium customarily used for software interchange; or,
161
162 b) Accompany it with a written offer, valid for at least three
163 years, to give any third party, for a charge no more than your
164 cost of physically performing source distribution, a complete
165 machine-readable copy of the corresponding source code, to be
166 distributed under the terms of Sections 1 and 2 above on a medium
167 customarily used for software interchange; or,
168
169 c) Accompany it with the information you received as to the offer
170 to distribute corresponding source code. (This alternative is
171 allowed only for noncommercial distribution and only if you
172 received the program in object code or executable form with such
173 an offer, in accord with Subsection b above.)
174
175 The source code for a work means the preferred form of the work for
176 making modifications to it. For an executable work, complete source
177 code means all the source code for all modules it contains, plus any
178 associated interface definition files, plus the scripts used to
179 control compilation and installation of the executable. However, as a
180 special exception, the source code distributed need not include
181 anything that is normally distributed (in either source or binary
182 form) with the major components (compiler, kernel, and so on) of the
183 operating system on which the executable runs, unless that component
184 itself accompanies the executable.
185
186 If distribution of executable or object code is made by offering
187 access to copy from a designated place, then offering equivalent
188 access to copy the source code from the same place counts as
189 distribution of the source code, even though third parties are not
190 compelled to copy the source along with the object code.
191
192 4. You may not copy, modify, sublicense, or distribute the Program
193 except as expressly provided under this License. Any attempt
194 otherwise to copy, modify, sublicense or distribute the Program is
195 void, and will automatically terminate your rights under this License.
196 However, parties who have received copies, or rights, from you under
197 this License will not have their licenses terminated so long as such
198 parties remain in full compliance.
199
200 5. You are not required to accept this License, since you have not
201 signed it. However, nothing else grants you permission to modify or
202 distribute the Program or its derivative works. These actions are
203 prohibited by law if you do not accept this License. Therefore, by
204 modifying or distributing the Program (or any work based on the
205 Program), you indicate your acceptance of this License to do so, and
206 all its terms and conditions for copying, distributing or modifying
207 the Program or works based on it.
208
209 6. Each time you redistribute the Program (or any work based on the
210 Program), the recipient automatically receives a license from the
211 original licensor to copy, distribute or modify the Program subject to
212 these terms and conditions. You may not impose any further
213 restrictions on the recipients' exercise of the rights granted herein.
214 You are not responsible for enforcing compliance by third parties to
215 this License.
216
217 7. If, as a consequence of a court judgment or allegation of patent
218 infringement or for any other reason (not limited to patent issues),
219 conditions are imposed on you (whether by court order, agreement or
220 otherwise) that contradict the conditions of this License, they do not
221 excuse you from the conditions of this License. If you cannot
222 distribute so as to satisfy simultaneously your obligations under this
223 License and any other pertinent obligations, then as a consequence you
224 may not distribute the Program at all. For example, if a patent
225 license would not permit royalty-free redistribution of the Program by
226 all those who receive copies directly or indirectly through you, then
227 the only way you could satisfy both it and this License would be to
228 refrain entirely from distribution of the Program.
229
230 If any portion of this section is held invalid or unenforceable under
231 any particular circumstance, the balance of the section is intended to
232 apply and the section as a whole is intended to apply in other
233 circumstances.
234
235 It is not the purpose of this section to induce you to infringe any
236 patents or other property right claims or to contest validity of any
237 such claims; this section has the sole purpose of protecting the
238 integrity of the free software distribution system, which is
239 implemented by public license practices. Many people have made
240 generous contributions to the wide range of software distributed
241 through that system in reliance on consistent application of that
242 system; it is up to the author/donor to decide if he or she is willing
243 to distribute software through any other system and a licensee cannot
244 impose that choice.
245
246 This section is intended to make thoroughly clear what is believed to
247 be a consequence of the rest of this License.
248
249 8. If the distribution and/or use of the Program is restricted in
250 certain countries either by patents or by copyrighted interfaces, the
251 original copyright holder who places the Program under this License
252 may add an explicit geographical distribution limitation excluding
253 those countries, so that distribution is permitted only in or among
254 countries not thus excluded. In such case, this License incorporates
255 the limitation as if written in the body of this License.
256
257 9. The Free Software Foundation may publish revised and/or new versions
258 of the General Public License from time to time. Such new versions will
259 be similar in spirit to the present version, but may differ in detail to
260 address new problems or concerns.
261
262 Each version is given a distinguishing version number. If the Program
263 specifies a version number of this License which applies to it and "any
264 later version", you have the option of following the terms and conditions
265 either of that version or of any later version published by the Free
266 Software Foundation. If the Program does not specify a version number of
267 this License, you may choose any version ever published by the Free Software
268 Foundation.
269
270 10. If you wish to incorporate parts of the Program into other free
271 programs whose distribution conditions are different, write to the author
272 to ask for permission. For software which is copyrighted by the Free
273 Software Foundation, write to the Free Software Foundation; we sometimes
274 make exceptions for this. Our decision will be guided by the two goals
275 of preserving the free status of all derivatives of our free software and
276 of promoting the sharing and reuse of software generally.
277
278 NO WARRANTY
279
280 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
281 FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN
282 OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
283 PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
284 OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
285 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS
286 TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE
287 PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
288 REPAIR OR CORRECTION.
289
290 12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
291 WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
292 REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
293 INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
294 OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
295 TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
296 YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
297 PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
298 POSSIBILITY OF SUCH DAMAGES.
299
300 END OF TERMS AND CONDITIONS
301
302 How to Apply These Terms to Your New Programs
303
304 If you develop a new program, and you want it to be of the greatest
305 possible use to the public, the best way to achieve this is to make it
306 free software which everyone can redistribute and change under these terms.
307
308 To do so, attach the following notices to the program. It is safest
309 to attach them to the start of each source file to most effectively
310 convey the exclusion of warranty; and each file should have at least
311 the "copyright" line and a pointer to where the full notice is found.
312
313 <one line to give the program's name and a brief idea of what it does.>
314 Copyright (C) <year> <name of author>
315
316 This program is free software; you can redistribute it and/or modify
317 it under the terms of the GNU General Public License as published by
318 the Free Software Foundation; either version 2 of the License, or
319 (at your option) any later version.
320
321 This program is distributed in the hope that it will be useful,
322 but WITHOUT ANY WARRANTY; without even the implied warranty of
323 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
324 GNU General Public License for more details.
325
326 You should have received a copy of the GNU General Public License along
327 with this program; if not, write to the Free Software Foundation, Inc.,
328 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
329
330 Also add information on how to contact you by electronic and paper mail.
331
332 If the program is interactive, make it output a short notice like this
333 when it starts in an interactive mode:
334
335 Gnomovision version 69, Copyright (C) year name of author
336 Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
337 This is free software, and you are welcome to redistribute it
338 under certain conditions; type `show c' for details.
339
340 The hypothetical commands `show w' and `show c' should show the appropriate
341 parts of the General Public License. Of course, the commands you use may
342 be called something other than `show w' and `show c'; they could even be
343 mouse-clicks or menu items--whatever suits your program.
344
345 You should also get your employer (if you work as a programmer) or your
346 school, if any, to sign a "copyright disclaimer" for the program, if
347 necessary. Here is a sample; alter the names:
348
349 Yoyodyne, Inc., hereby disclaims all copyright interest in the program
350 `Gnomovision' (which makes passes at compilers) written by James Hacker.
351
352 <signature of Ty Coon>, 1 April 1989
353 Ty Coon, President of Vice
354
355 This General Public License does not permit incorporating your program into
356 proprietary programs. If your program is a subroutine library, you may
357 consider it more useful to permit linking proprietary applications with the
358 library. If this is what you want to do, use the GNU Lesser General
359 Public License instead of this License.