1Valid-License-Identifier: GPL-2.0
2Valid-License-Identifier: GPL-2.0-only
3Valid-License-Identifier: GPL-2.0+
4Valid-License-Identifier: GPL-2.0-or-later
5SPDX-URL: https://spdx.org/licenses/GPL-2.0.html
6Usage-Guide:
7  To use this license in source code, put one of the following SPDX
8  tag/value pairs into a comment according to the placement
9  guidelines in the licensing rules documentation.
10  For 'GNU General Public License (GPL) version 2 only' use:
11    SPDX-License-Identifier: GPL-2.0
12  or
13    SPDX-License-Identifier: GPL-2.0-only
14  For 'GNU General Public License (GPL) version 2 or any later version' use:
15    SPDX-License-Identifier: GPL-2.0+
16  or
17    SPDX-License-Identifier: GPL-2.0-or-later
18License-Text:
19
20		    GNU GENERAL PUBLIC LICENSE
21		       Version 2, June 1991
22
23 Copyright (C) 1989, 1991 Free Software Foundation, Inc.
24                       51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
25 Everyone is permitted to copy and distribute verbatim copies
26 of this license document, but changing it is not allowed.
27
28			    Preamble
29
30  The licenses for most software are designed to take away your
31freedom to share and change it.  By contrast, the GNU General Public
32License is intended to guarantee your freedom to share and change free
33software--to make sure the software is free for all its users.  This
34General Public License applies to most of the Free Software
35Foundation's software and to any other program whose authors commit to
36using it.  (Some other Free Software Foundation software is covered by
37the GNU Library General Public License instead.)  You can apply it to
38your programs, too.
39
40  When we speak of free software, we are referring to freedom, not
41price.  Our General Public Licenses are designed to make sure that you
42have the freedom to distribute copies of free software (and charge for
43this service if you wish), that you receive source code or can get it
44if you want it, that you can change the software or use pieces of it
45in new free programs; and that you know you can do these things.
46
47  To protect your rights, we need to make restrictions that forbid
48anyone to deny you these rights or to ask you to surrender the rights.
49These restrictions translate to certain responsibilities for you if you
50distribute copies of the software, or if you modify it.
51
52  For example, if you distribute copies of such a program, whether
53gratis or for a fee, you must give the recipients all the rights that
54you have.  You must make sure that they, too, receive or can get the
55source code.  And you must show them these terms so they know their
56rights.
57
58  We protect your rights with two steps: (1) copyright the software, and
59(2) offer you this license which gives you legal permission to copy,
60distribute and/or modify the software.
61
62  Also, for each author's protection and ours, we want to make certain
63that everyone understands that there is no warranty for this free
64software.  If the software is modified by someone else and passed on, we
65want its recipients to know that what they have is not the original, so
66that any problems introduced by others will not reflect on the original
67authors' reputations.
68
69  Finally, any free program is threatened constantly by software
70patents.  We wish to avoid the danger that redistributors of a free
71program will individually obtain patent licenses, in effect making the
72program proprietary.  To prevent this, we have made it clear that any
73patent must be licensed for everyone's free use or not licensed at all.
74
75  The precise terms and conditions for copying, distribution and
76modification follow.
77
78		    GNU GENERAL PUBLIC LICENSE
79   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
80
81  0. 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".
90
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.
97
98  1. You may copy and distribute verbatim copies of the Program's
99source code as you receive it, in any medium, provided that you
100conspicuously and appropriately publish on each copy an appropriate
101copyright notice and disclaimer of warranty; keep intact all the
102notices that refer to this License and to the absence of any warranty;
103and give any other recipients of the Program a copy of this License
104along with the Program.
105
106You may charge a fee for the physical act of transferring a copy, and
107you may at your option offer warranty protection in exchange for a fee.
108
109  2. You may modify your copy or copies of the Program or any portion
110of it, thus forming a work based on the Program, and copy and
111distribute such modifications or work under the terms of Section 1
112above, provided that you also meet all of these conditions:
113
114    a) You must cause the modified files to carry prominent notices
115    stating that you changed the files and the date of any change.
116
117    b) You must cause any work that you distribute or publish, that in
118    whole or in part contains or is derived from the Program or any
119    part thereof, to be licensed as a whole at no charge to all third
120    parties under the terms of this License.
121
122    c) If the modified program normally reads commands interactively
123    when run, you must cause it, when started running for such
124    interactive use in the most ordinary way, to print or display an
125    announcement including an appropriate copyright notice and a
126    notice that there is no warranty (or else, saying that you provide
127    a warranty) and that users may redistribute the program under
128    these conditions, and telling the user how to view a copy of this
129    License.  (Exception: if the Program itself is interactive but
130    does not normally print such an announcement, your work based on
131    the Program is not required to print an announcement.)
132
133These requirements apply to the modified work as a whole.  If
134identifiable sections of that work are not derived from the Program,
135and can be reasonably considered independent and separate works in
136themselves, then this License, and its terms, do not apply to those
137sections when you distribute them as separate works.  But when you
138distribute the same sections as part of a whole which is a work based
139on the Program, the distribution of the whole must be on the terms of
140this License, whose permissions for other licensees extend to the
141entire whole, and thus to each and every part regardless of who wrote it.
142
143Thus, it is not the intent of this section to claim rights or contest
144your rights to work written entirely by you; rather, the intent is to
145exercise the right to control the distribution of derivative or
146collective works based on the Program.
147
148In addition, mere aggregation of another work not based on the Program
149with the Program (or with a work based on the Program) on a volume of
150a storage or distribution medium does not bring the other work under
151the scope of this License.
152
153  3. You may copy and distribute the Program (or a work based on it,
154under Section 2) in object code or executable form under the terms of
155Sections 1 and 2 above provided that you also do one of the following:
156
157    a) Accompany it with the complete corresponding machine-readable
158    source code, which must be distributed under the terms of Sections
159    1 and 2 above on a medium customarily used for software interchange; or,
160
161    b) Accompany it with a written offer, valid for at least three
162    years, to give any third party, for a charge no more than your
163    cost of physically performing source distribution, a complete
164    machine-readable copy of the corresponding source code, to be
165    distributed under the terms of Sections 1 and 2 above on a medium
166    customarily used for software interchange; or,
167
168    c) Accompany it with the information you received as to the offer
169    to distribute corresponding source code.  (This alternative is
170    allowed only for noncommercial distribution and only if you
171    received the program in object code or executable form with such
172    an offer, in accord with Subsection b above.)
173
174The source code for a work means the preferred form of the work for
175making modifications to it.  For an executable work, complete source
176code means all the source code for all modules it contains, plus any
177associated interface definition files, plus the scripts used to
178control compilation and installation of the executable.  However, as a
179special exception, the source code distributed need not include
180anything that is normally distributed (in either source or binary
181form) with the major components (compiler, kernel, and so on) of the
182operating system on which the executable runs, unless that component
183itself accompanies the executable.
184
185If distribution of executable or object code is made by offering
186access to copy from a designated place, then offering equivalent
187access to copy the source code from the same place counts as
188distribution of the source code, even though third parties are not
189compelled to copy the source along with the object code.
190
191  4. You may not copy, modify, sublicense, or distribute the Program
192except as expressly provided under this License.  Any attempt
193otherwise to copy, modify, sublicense or distribute the Program is
194void, and will automatically terminate your rights under this License.
195However, parties who have received copies, or rights, from you under
196this License will not have their licenses terminated so long as such
197parties remain in full compliance.
198
199  5. You are not required to accept this License, since you have not
200signed it.  However, nothing else grants you permission to modify or
201distribute the Program or its derivative works.  These actions are
202prohibited by law if you do not accept this License.  Therefore, by
203modifying or distributing the Program (or any work based on the
204Program), you indicate your acceptance of this License to do so, and
205all its terms and conditions for copying, distributing or modifying
206the Program or works based on it.
207
208  6. Each time you redistribute the Program (or any work based on the
209Program), the recipient automatically receives a license from the
210original licensor to copy, distribute or modify the Program subject to
211these terms and conditions.  You may not impose any further
212restrictions on the recipients' exercise of the rights granted herein.
213You are not responsible for enforcing compliance by third parties to
214this License.
215
216  7. If, as a consequence of a court judgment or allegation of patent
217infringement or for any other reason (not limited to patent issues),
218conditions are imposed on you (whether by court order, agreement or
219otherwise) that contradict the conditions of this License, they do not
220excuse you from the conditions of this License.  If you cannot
221distribute so as to satisfy simultaneously your obligations under this
222License and any other pertinent obligations, then as a consequence you
223may not distribute the Program at all.  For example, if a patent
224license would not permit royalty-free redistribution of the Program by
225all those who receive copies directly or indirectly through you, then
226the only way you could satisfy both it and this License would be to
227refrain entirely from distribution of the Program.
228
229If any portion of this section is held invalid or unenforceable under
230any particular circumstance, the balance of the section is intended to
231apply and the section as a whole is intended to apply in other
232circumstances.
233
234It is not the purpose of this section to induce you to infringe any
235patents or other property right claims or to contest validity of any
236such claims; this section has the sole purpose of protecting the
237integrity of the free software distribution system, which is
238implemented by public license practices.  Many people have made
239generous contributions to the wide range of software distributed
240through that system in reliance on consistent application of that
241system; it is up to the author/donor to decide if he or she is willing
242to distribute software through any other system and a licensee cannot
243impose that choice.
244
245This section is intended to make thoroughly clear what is believed to
246be a consequence of the rest of this License.
247
248  8. If the distribution and/or use of the Program is restricted in
249certain countries either by patents or by copyrighted interfaces, the
250original copyright holder who places the Program under this License
251may add an explicit geographical distribution limitation excluding
252those countries, so that distribution is permitted only in or among
253countries not thus excluded.  In such case, this License incorporates
254the limitation as if written in the body of this License.
255
256  9. The Free Software Foundation may publish revised and/or new versions
257of the General Public License from time to time.  Such new versions will
258be similar in spirit to the present version, but may differ in detail to
259address new problems or concerns.
260
261Each version is given a distinguishing version number.  If the Program
262specifies a version number of this License which applies to it and "any
263later version", you have the option of following the terms and conditions
264either of that version or of any later version published by the Free
265Software Foundation.  If the Program does not specify a version number of
266this License, you may choose any version ever published by the Free Software
267Foundation.
268
269  10. If you wish to incorporate parts of the Program into other free
270programs whose distribution conditions are different, write to the author
271to ask for permission.  For software which is copyrighted by the Free
272Software Foundation, write to the Free Software Foundation; we sometimes
273make exceptions for this.  Our decision will be guided by the two goals
274of preserving the free status of all derivatives of our free software and
275of promoting the sharing and reuse of software generally.
276
277			    NO WARRANTY
278
279  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
280FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
281OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
282PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
283OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
284MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
285TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
286PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
287REPAIR OR CORRECTION.
288
289  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
290WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
291REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
292INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
293OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
294TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
295YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
296PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
297POSSIBILITY OF SUCH DAMAGES.
298
299		     END OF TERMS AND CONDITIONS
300
301	    How to Apply These Terms to Your New Programs
302
303  If you develop a new program, and you want it to be of the greatest
304possible use to the public, the best way to achieve this is to make it
305free software which everyone can redistribute and change under these terms.
306
307  To do so, attach the following notices to the program.  It is safest
308to attach them to the start of each source file to most effectively
309convey the exclusion of warranty; and each file should have at least
310the "copyright" line and a pointer to where the full notice is found.
311
312    <one line to give the program's name and a brief idea of what it does.>
313    Copyright (C) <year>  <name of author>
314
315    This program is free software; you can redistribute it and/or modify
316    it under the terms of the GNU General Public License as published by
317    the Free Software Foundation; either version 2 of the License, or
318    (at your option) any later version.
319
320    This program is distributed in the hope that it will be useful,
321    but WITHOUT ANY WARRANTY; without even the implied warranty of
322    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
323    GNU General Public License for more details.
324
325    You should have received a copy of the GNU General Public License
326    along with this program; if not, write to the Free Software
327    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
328
329
330Also add information on how to contact you by electronic and paper mail.
331
332If the program is interactive, make it output a short notice like this
333when 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
340The hypothetical commands `show w' and `show c' should show the appropriate
341parts of the General Public License.  Of course, the commands you use may
342be called something other than `show w' and `show c'; they could even be
343mouse-clicks or menu items--whatever suits your program.
344
345You should also get your employer (if you work as a programmer) or your
346school, if any, to sign a "copyright disclaimer" for the program, if
347necessary.  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
355This General Public License does not permit incorporating your program into
356proprietary programs.  If your program is a subroutine library, you may
357consider it more useful to permit linking proprietary applications with the
358library.  If this is what you want to do, use the GNU Library General
359Public License instead of this License.
360