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