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