source: git/doc/GPL.htm @ c359bfd

RELEASE/1.0RELEASE/1.1RELEASE/1.2debug-cidebug-ci-sanitisersstereowalls-data
Last change on this file since c359bfd was c359bfd, checked in by Olly Betts <olly@…>, 23 years ago

Documentation updates and fettles.

Fixes for RISC OS packaging.

git-svn-id: file:///home/survex-svn/survex/trunk@1464 4b37db11-9a0c-4f06-9ece-9ab7cdaee568

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1<HTML><HEAD>
2<TITLE>GNU GENERAL PUBLIC LICENSE</TITLE>
3<STYLE type="text/css"><!--
4BODY, TD, CENTER, UL, OL {font-family: sans-serif;}
5-->
6</STYLE>
7</HEAD><BODY BGCOLOR=white TEXT=black>
8<h1 align=center>GNU GENERAL PUBLIC LICENSE<br>Version 2, June 1991</h1>
9
10<p>
11 Copyright (C) 1989, 1991 Free Software Foundation, Inc.
12                       59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
13</p>
14<p>
15 Everyone is permitted to copy and distribute verbatim copies
16 of this license document, but changing it is not allowed.
17</p>
18
19<h2 align=center>Preamble</h2>
20
21<p>The licenses for most software are designed to take away your
22freedom to share and change it.  By contrast, the GNU General Public
23License is intended to guarantee your freedom to share and change free
24software--to make sure the software is free for all its users.  This
25General Public License applies to most of the Free Software
26Foundation's software and to any other program whose authors commit to
27using it.  (Some other Free Software Foundation software is covered by
28the GNU Library General Public License instead.)  You can apply it to
29your programs, too.
30</p>
31
32<p>When we speak of free software, we are referring to freedom, not
33price.  Our General Public Licenses are designed to make sure that you
34have the freedom to distribute copies of free software (and charge for
35this service if you wish), that you receive source code or can get it
36if you want it, that you can change the software or use pieces of it
37in new free programs; and that you know you can do these things.
38
39<p>To protect your rights, we need to make restrictions that forbid
40anyone to deny you these rights or to ask you to surrender the rights.
41These restrictions translate to certain responsibilities for you if you
42distribute copies of the software, or if you modify it.
43</p>
44
45<p>For example, if you distribute copies of such a program, whether
46gratis or for a fee, you must give the recipients all the rights that
47you have.  You must make sure that they, too, receive or can get the
48source code.  And you must show them these terms so they know their
49rights.
50</p>
51
52<p>We protect your rights with two steps: (1) copyright the software, and
53(2) offer you this license which gives you legal permission to copy,
54distribute and/or modify the software.
55</p>
56
57<p>Also, for each author's protection and ours, we want to make certain
58that everyone understands that there is no warranty for this free
59software.  If the software is modified by someone else and passed on, we
60want its recipients to know that what they have is not the original, so
61that any problems introduced by others will not reflect on the original
62authors' reputations.
63</p>
64
65<p>Finally, any free program is threatened constantly by software
66patents.  We wish to avoid the danger that redistributors of a free
67program will individually obtain patent licenses, in effect making the
68program proprietary.  To prevent this, we have made it clear that any
69patent must be licensed for everyone's free use or not licensed at all.
70</p>
71
72<p>The precise terms and conditions for copying, distribution and
73modification follow.</p>
74
75<hr>
76<h1 align=center>
77                    GNU GENERAL PUBLIC LICENSE<br>
78   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION</h1>
79
80<ol TYPE=1 START=0>
81<li><p>This License applies to any program or other work which contains
82a notice placed by the copyright holder saying it may be distributed
83under the terms of this General Public License.  The "Program", below,
84refers to any such program or work, and a "work based on the Program"
85means either the Program or any derivative work under copyright law:
86that is to say, a work containing the Program or a portion of it,
87either verbatim or with modifications and/or translated into another
88language.  (Hereinafter, translation is included without limitation in
89the term "modification".)  Each licensee is addressed as "you".</p>
90<p>
91Activities other than copying, distribution and modification are not
92covered by this License; they are outside its scope.  The act of
93running the Program is not restricted, and the output from the Program
94is covered only if its contents constitute a work based on the
95Program (independent of having been made by running the Program).
96Whether that is true depends on what the Program does.</p></li>
97</ol>
98
99<!-- Many browsers seem to ignore START=0, so restart on element 1 so
100 most items get the correct number -->
101<ol TYPE=1 START=1>
102<li><p>You may copy and distribute verbatim copies of the Program's
103source code as you receive it, in any medium, provided that you
104conspicuously and appropriately publish on each copy an appropriate
105copyright notice and disclaimer of warranty; keep intact all the
106notices that refer to this License and to the absence of any warranty;
107and give any other recipients of the Program a copy of this License
108along with the Program.</p>
109
110<p>
111You may charge a fee for the physical act of transferring a copy, and
112you may at your option offer warranty protection in exchange for a
113fee.</p></li>
114
115<li><p>You may modify your copy or copies of the Program or any portion
116of it, thus forming a work based on the Program, and copy and
117distribute such modifications or work under the terms of Section 1
118above, provided that you also meet all of these conditions:</p>
119
120<ol TYPE=a>
121<li><p>You must cause the modified files to carry prominent notices
122stating that you changed the files and the date of any
123change.</p></li>
124
125<li><p>You must cause any work that you distribute or publish, that in
126whole or in part contains or is derived from the Program or any
127part thereof, to be licensed as a whole at no charge to all third
128parties under the terms of this License.</p></li>
129
130<li><p>If the modified program normally reads commands interactively
131when run, you must cause it, when started running for such
132interactive use in the most ordinary way, to print or display an
133announcement including an appropriate copyright notice and a
134notice that there is no warranty (or else, saying that you provide
135a warranty) and that users may redistribute the program under
136these conditions, and telling the user how to view a copy of this
137License.  (Exception: if the Program itself is interactive but
138does not normally print such an announcement, your work based on
139the Program is not required to print an announcement.)</p></li>
140</ol>
141
142<p>
143These requirements apply to the modified work as a whole.  If
144identifiable sections of that work are not derived from the Program,
145and can be reasonably considered independent and separate works in
146themselves, then this License, and its terms, do not apply to those
147sections when you distribute them as separate works.  But when you
148distribute the same sections as part of a whole which is a work based
149on the Program, the distribution of the whole must be on the terms of
150this License, whose permissions for other licensees extend to the
151entire whole, and thus to each and every part regardless of who wrote
152it.</p>
153
154<p>
155Thus, it is not the intent of this section to claim rights or contest
156your rights to work written entirely by you; rather, the intent is to
157exercise the right to control the distribution of derivative or
158collective works based on the Program.</p>
159
160<p>
161In addition, mere aggregation of another work not based on the Program
162with the Program (or with a work based on the Program) on a volume of
163a storage or distribution medium does not bring the other work under
164the scope of this License.</p></li>
165
166<li><p>You may copy and distribute the Program (or a work based on it,
167under Section 2) in object code or executable form under the terms of
168Sections 1 and 2 above provided that you also do one of the
169following:</p>
170
171<ol TYPE=a>
172<li><p>Accompany it with the complete corresponding machine-readable
173    source code, which must be distributed under the terms of Sections
174    1 and 2 above on a medium customarily used for software
175    interchange; or,</p></li>
176
177<li><p>Accompany it with a written offer, valid for at least three
178    years, to give any third party, for a charge no more than your
179    cost of physically performing source distribution, a complete
180    machine-readable copy of the corresponding source code, to be
181    distributed under the terms of Sections 1 and 2 above on a medium
182    customarily used for software interchange; or,</p></li>
183
184<li><p>Accompany it with the information you received as to the offer
185    to distribute corresponding source code.  (This alternative is
186    allowed only for noncommercial distribution and only if you
187    received the program in object code or executable form with such
188    an offer, in accord with Subsection b above.)</p></li>
189</ol>
190
191<p>
192The source code for a work means the preferred form of the work for
193making modifications to it.  For an executable work, complete source
194code means all the source code for all modules it contains, plus any
195associated interface definition files, plus the scripts used to
196control compilation and installation of the executable.  However, as a
197special exception, the source code distributed need not include
198anything that is normally distributed (in either source or binary
199form) with the major components (compiler, kernel, and so on) of the
200operating system on which the executable runs, unless that component
201itself accompanies the executable.</p>
202
203<p>
204If distribution of executable or object code is made by offering
205access to copy from a designated place, then offering equivalent
206access to copy the source code from the same place counts as
207distribution of the source code, even though third parties are not
208compelled to copy the source along with the object code.</p></li>
209
210<li><p>You may not copy, modify, sublicense, or distribute the Program
211except as expressly provided under this License.  Any attempt
212otherwise to copy, modify, sublicense or distribute the Program is
213void, and will automatically terminate your rights under this License.
214However, parties who have received copies, or rights, from you under
215this License will not have their licenses terminated so long as such
216parties remain in full compliance.</p></li>
217
218<li><p>You are not required to accept this License, since you have not
219signed it.  However, nothing else grants you permission to modify or
220distribute the Program or its derivative works.  These actions are
221prohibited by law if you do not accept this License.  Therefore, by
222modifying or distributing the Program (or any work based on the
223Program), you indicate your acceptance of this License to do so, and
224all its terms and conditions for copying, distributing or modifying
225the Program or works based on it.</p></li>
226
227<li><p>Each time you redistribute the Program (or any work based on the
228Program), the recipient automatically receives a license from the
229original licensor to copy, distribute or modify the Program subject to
230these terms and conditions.  You may not impose any further
231restrictions on the recipients' exercise of the rights granted herein.
232You are not responsible for enforcing compliance by third parties to
233this License.</p></li>
234
235<li><p>If, as a consequence of a court judgment or allegation of patent
236infringement or for any other reason (not limited to patent issues),
237conditions are imposed on you (whether by court order, agreement or
238otherwise) that contradict the conditions of this License, they do not
239excuse you from the conditions of this License.  If you cannot
240distribute so as to satisfy simultaneously your obligations under this
241License and any other pertinent obligations, then as a consequence you
242may not distribute the Program at all.  For example, if a patent
243license would not permit royalty-free redistribution of the Program by
244all those who receive copies directly or indirectly through you, then
245the only way you could satisfy both it and this License would be to
246refrain entirely from distribution of the Program.</p>
247
248<p>If any portion of this section is held invalid or unenforceable under
249any particular circumstance, the balance of the section is intended to
250apply and the section as a whole is intended to apply in other
251circumstances.</p>
252
253<p>It is not the purpose of this section to induce you to infringe any
254patents or other property right claims or to contest validity of any
255such claims; this section has the sole purpose of protecting the
256integrity of the free software distribution system, which is
257implemented by public license practices.  Many people have made
258generous contributions to the wide range of software distributed
259through that system in reliance on consistent application of that
260system; it is up to the author/donor to decide if he or she is willing
261to distribute software through any other system and a licensee cannot
262impose that choice.</p>
263
264<p>This section is intended to make thoroughly clear what is believed to
265be a consequence of the rest of this License.</p></li>
266
267<li><p>If the distribution and/or use of the Program is restricted in
268certain countries either by patents or by copyrighted interfaces, the
269original copyright holder who places the Program under this License
270may add an explicit geographical distribution limitation excluding
271those countries, so that distribution is permitted only in or among
272countries not thus excluded.  In such case, this License incorporates
273the limitation as if written in the body of this License.</p></li>
274
275<li><p>The Free Software Foundation may publish revised and/or new versions
276of the General Public License from time to time.  Such new versions will
277be similar in spirit to the present version, but may differ in detail to
278address new problems or concerns.</p>
279
280<p> Each version is given a distinguishing version number.  If the Program
281specifies a version number of this License which applies to it and "any
282later version", you have the option of following the terms and conditions
283either of that version or of any later version published by the Free
284Software Foundation.  If the Program does not specify a version number of
285this License, you may choose any version ever published by the Free Software
286Foundation.</p></li>
287
288<li><p>If you wish to incorporate parts of the Program into other free
289programs whose distribution conditions are different, write to the author
290to ask for permission.  For software which is copyrighted by the Free
291Software Foundation, write to the Free Software Foundation; we sometimes
292make exceptions for this.  Our decision will be guided by the two goals
293of preserving the free status of all derivatives of our free software and
294of promoting the sharing and reuse of software generally.</p></li>
295</ol>
296
297<h2 align=center>NO WARRANTY</h2>
298
299<ol TYPE=1 START=11>
300<li><p>BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
301FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
302OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
303PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
304OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
305MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
306TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
307PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
308REPAIR OR CORRECTION.</p></li>
309
310<li><p>IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
311WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
312REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
313INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
314OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
315TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
316YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
317PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
318POSSIBILITY OF SUCH DAMAGES.</p></li>
319</ol>
320
321<h2 align=center>END OF TERMS AND CONDITIONS</h2>
322
323<hr>
324<h2 align=center>How to Apply These Terms to Your New Programs</h2>
325
326<p>If you develop a new program, and you want it to be of the greatest
327possible use to the public, the best way to achieve this is to make it
328free software which everyone can redistribute and change under these
329terms.</p>
330
331<p>To do so, attach the following notices to the program.  It is safest
332to attach them to the start of each source file to most effectively
333convey the exclusion of warranty; and each file should have at least
334the "copyright" line and a pointer to where the full notice is
335found.</p>
336
337<pre>
338  &lt;one line to give the program's name and a brief idea of what it does.&gt;
339  Copyright (C) 19yy  &lt;name of author&gt;
340
341  This program is free software; you can redistribute it and/or modify
342  it under the terms of the GNU General Public License as published by
343  the Free Software Foundation; either version 2 of the License, or
344  (at your option) any later version.
345
346  This program is distributed in the hope that it will be useful,
347  but WITHOUT ANY WARRANTY; without even the implied warranty of
348  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
349  GNU General Public License for more details.
350
351  You should have received a copy of the GNU General Public License
352  along with this program; if not, write to the Free Software
353  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
354</pre>
355
356<p>Also add information on how to contact you by electronic and paper
357mail.</p>
358
359<p>If the program is interactive, make it output a short notice like this
360when it starts in an interactive mode:</p>
361
362<pre>
363  Gnomovision version 69, Copyright (C) 19yy name of author
364  Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
365  This is free software, and you are welcome to redistribute it
366  under certain conditions; type `show c' for details.
367</pre>
368
369<p>
370The hypothetical commands `show w' and `show c' should show the appropriate
371parts of the General Public License.  Of course, the commands you use may
372be called something other than `show w' and `show c'; they could even be
373mouse-clicks or menu items--whatever suits your program.</p>
374
375<p>
376You should also get your employer (if you work as a programmer) or your
377school, if any, to sign a "copyright disclaimer" for the program, if
378necessary.  Here is a sample; alter the names:</p>
379
380<pre>
381  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
382  `Gnomovision' (which makes passes at compilers) written by James Hacker.
383
384  &lt;signature of Ty Coon&gt;, 1 April 1989
385  Ty Coon, President of Vice
386</pre>
387
388<p>This General Public License does not permit incorporating your program into
389proprietary programs.  If your program is a subroutine library, you may
390consider it more useful to permit linking proprietary applications with the
391library.  If this is what you want to do, use the GNU Library General
392Public License instead of this License.</p>
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