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1 <!DOCTYPE html PUBLIC "-//IETF//DTD HTML 2.0//EN">
2 <HTML>
3 <HEAD>
4 <TITLE>GNU General Public License</TITLE>
5 </HEAD>
6 <BODY BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#1F00FF" ALINK="#FF0000" VLINK="#9900DD">
7 <H1>GNU General Public License</H1>
8 <P>
9 Version 2, June 1991
10
11 </P>
12
13 <PRE>
14 Copyright (C) 1989, 1991 Free Software Foundation, Inc.
15 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
16
17 Everyone is permitted to copy and distribute verbatim copies
18 of this license document, but changing it is not allowed.
19 </PRE>
20
21
22
23 <H2>Preamble</H2>
24
25 <P>
26 The licenses for most software are designed to take away your
27 freedom to share and change it. By contrast, the GNU General Public
28 License is intended to guarantee your freedom to share and change free
29 software--to make sure the software is free for all its users. This
30 General Public License applies to most of the Free Software
31 Foundation's software and to any other program whose authors commit to
32 using it. (Some other Free Software Foundation software is covered by
33 the GNU Library General Public License instead.) You can apply it to
34 your programs, too.
35
36 </P>
37 <P>
38 When we speak of free software, we are referring to freedom, not
39 price. Our General Public Licenses are designed to make sure that you
40 have the freedom to distribute copies of free software (and charge for
41 this service if you wish), that you receive source code or can get it
42 if you want it, that you can change the software or use pieces of it
43 in new free programs; and that you know you can do these things.
44
45 </P>
46 <P>
47 To protect your rights, we need to make restrictions that forbid
48 anyone to deny you these rights or to ask you to surrender the rights.
49 These restrictions translate to certain responsibilities for you if you
50 distribute copies of the software, or if you modify it.
51
52 </P>
53 <P>
54 For example, if you distribute copies of such a program, whether
55 gratis or for a fee, you must give the recipients all the rights that
56 you have. You must make sure that they, too, receive or can get the
57 source code. And you must show them these terms so they know their
58 rights.
59
60 </P>
61 <P>
62 We protect your rights with two steps: (1) copyright the software, and
63 (2) offer you this license which gives you legal permission to copy,
64 distribute and/or modify the software.
65
66 </P>
67 <P>
68 Also, for each author's protection and ours, we want to make certain
69 that everyone understands that there is no warranty for this free
70 software. If the software is modified by someone else and passed on, we
71 want its recipients to know that what they have is not the original, so
72 that any problems introduced by others will not reflect on the original
73 authors' reputations.
74
75 </P>
76 <P>
77 Finally, any free program is threatened constantly by software
78 patents. We wish to avoid the danger that redistributors of a free
79 program will individually obtain patent licenses, in effect making the
80 program proprietary. To prevent this, we have made it clear that any
81 patent must be licensed for everyone's free use or not licensed at all.
82
83 </P>
84 <P>
85 The precise terms and conditions for copying, distribution and
86 modification follow.
87
88 </P>
89
90
91 <H2>TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION</H2>
92 <P>
93
94 <STRONG>0.</STRONG>
95 This License applies to any program or other work which contains
96 a notice placed by the copyright holder saying it may be distributed
97 under the terms of this General Public License. The "Program", below,
98 refers to any such program or work, and a "work based on the Program"
99 means either the Program or any derivative work under copyright law:
100 that is to say, a work containing the Program or a portion of it,
101 either verbatim or with modifications and/or translated into another
102 language. (Hereinafter, translation is included without limitation in
103 the term "modification".) Each licensee is addressed as "you".
104 <P>
105
106 Activities other than copying, distribution and modification are not
107 covered by this License; they are outside its scope. The act of
108 running the Program is not restricted, and the output from the Program
109 is covered only if its contents constitute a work based on the
110 Program (independent of having been made by running the Program).
111 Whether that is true depends on what the Program does.
112
113 <P>
114
115 <STRONG>1.</STRONG>
116 You may copy and distribute verbatim copies of the Program's
117 source code as you receive it, in any medium, provided that you
118 conspicuously and appropriately publish on each copy an appropriate
119 copyright notice and disclaimer of warranty; keep intact all the
120 notices that refer to this License and to the absence of any warranty;
121 and give any other recipients of the Program a copy of this License
122 along with the Program.
123 <P>
124
125 You may charge a fee for the physical act of transferring a copy, and
126 you may at your option offer warranty protection in exchange for a fee.
127 <P>
128
129 <STRONG>2.</STRONG>
130 You may modify your copy or copies of the Program or any portion
131 of it, thus forming a work based on the Program, and copy and
132 distribute such modifications or work under the terms of Section 1
133 above, provided that you also meet all of these conditions:
134 <P>
135
136 <UL>
137
138 <LI><STRONG>a)</STRONG>
139 You must cause the modified files to carry prominent notices
140 stating that you changed the files and the date of any change.
141
142 <P>
143 <LI><STRONG>b)</STRONG>
144 You must cause any work that you distribute or publish, that in
145 whole or in part contains or is derived from the Program or any
146 part thereof, to be licensed as a whole at no charge to all third
147 parties under the terms of this License.
148
149 <P>
150 <LI><STRONG>c)</STRONG>
151 If the modified program normally reads commands interactively
152 when run, you must cause it, when started running for such
153 interactive use in the most ordinary way, to print or display an
154 announcement including an appropriate copyright notice and a
155 notice that there is no warranty (or else, saying that you provide
156 a warranty) and that users may redistribute the program under
157 these conditions, and telling the user how to view a copy of this
158 License. (Exception: if the Program itself is interactive but
159 does not normally print such an announcement, your work based on
160 the Program is not required to print an announcement.)
161 </UL>
162
163 These requirements apply to the modified work as a whole. If
164 identifiable sections of that work are not derived from the Program,
165 and can be reasonably considered independent and separate works in
166 themselves, then this License, and its terms, do not apply to those
167 sections when you distribute them as separate works. But when you
168 distribute the same sections as part of a whole which is a work based
169 on the Program, the distribution of the whole must be on the terms of
170 this License, whose permissions for other licensees extend to the
171 entire whole, and thus to each and every part regardless of who wrote it.
172 <P>
173
174 Thus, it is not the intent of this section to claim rights or contest
175 your rights to work written entirely by you; rather, the intent is to
176 exercise the right to control the distribution of derivative or
177 collective works based on the Program.
178 <P>
179
180 In addition, mere aggregation of another work not based on the Program
181 with the Program (or with a work based on the Program) on a volume of
182 a storage or distribution medium does not bring the other work under
183 the scope of this License.
184
185 <P>
186
187 <STRONG>3.</STRONG>
188 You may copy and distribute the Program (or a work based on it,
189 under Section 2) in object code or executable form under the terms of
190 Sections 1 and 2 above provided that you also do one of the following:
191
192
193 <!-- we use this doubled UL to get the sub-sections indented, -->
194 <!-- while making the bullets as unobvious as possible. -->
195 <UL>
196
197 <LI><STRONG>a)</STRONG>
198 Accompany it with the complete corresponding machine-readable
199 source code, which must be distributed under the terms of Sections
200 1 and 2 above on a medium customarily used for software interchange; or,
201
202 <P>
203 <LI><STRONG>b)</STRONG>
204 Accompany it with a written offer, valid for at least three
205 years, to give any third party, for a charge no more than your
206 cost of physically performing source distribution, a complete
207 machine-readable copy of the corresponding source code, to be
208 distributed under the terms of Sections 1 and 2 above on a medium
209 customarily used for software interchange; or,
210
211 <P>
212 <LI><STRONG>c)</STRONG>
213 Accompany it with the information you received as to the offer
214 to distribute corresponding source code. (This alternative is
215 allowed only for noncommercial distribution and only if you
216 received the program in object code or executable form with such
217 an offer, in accord with Subsection b above.)
218 </UL>
219
220 The source code for a work means the preferred form of the work for
221 making modifications to it. For an executable work, complete source
222 code means all the source code for all modules it contains, plus any
223 associated interface definition files, plus the scripts used to
224 control compilation and installation of the executable. However, as a
225 special exception, the source code distributed need not include
226 anything that is normally distributed (in either source or binary
227 form) with the major components (compiler, kernel, and so on) of the
228 operating system on which the executable runs, unless that component
229 itself accompanies the executable.
230 <P>
231
232 If distribution of executable or object code is made by offering
233 access to copy from a designated place, then offering equivalent
234 access to copy the source code from the same place counts as
235 distribution of the source code, even though third parties are not
236 compelled to copy the source along with the object code.
237 <P>
238
239 <STRONG>4.</STRONG>
240 You may not copy, modify, sublicense, or distribute the Program
241 except as expressly provided under this License. Any attempt
242 otherwise to copy, modify, sublicense or distribute the Program is
243 void, and will automatically terminate your rights under this License.
244 However, parties who have received copies, or rights, from you under
245 this License will not have their licenses terminated so long as such
246 parties remain in full compliance.
247
248 <P>
249
250 <STRONG>5.</STRONG>
251 You are not required to accept this License, since you have not
252 signed it. However, nothing else grants you permission to modify or
253 distribute the Program or its derivative works. These actions are
254 prohibited by law if you do not accept this License. Therefore, by
255 modifying or distributing the Program (or any work based on the
256 Program), you indicate your acceptance of this License to do so, and
257 all its terms and conditions for copying, distributing or modifying
258 the Program or works based on it.
259
260 <P>
261
262 <STRONG>6.</STRONG>
263 Each time you redistribute the Program (or any work based on the
264 Program), the recipient automatically receives a license from the
265 original licensor to copy, distribute or modify the Program subject to
266 these terms and conditions. You may not impose any further
267 restrictions on the recipients' exercise of the rights granted herein.
268 You are not responsible for enforcing compliance by third parties to
269 this License.
270
271 <P>
272
273 <STRONG>7.</STRONG>
274 If, as a consequence of a court judgment or allegation of patent
275 infringement or for any other reason (not limited to patent issues),
276 conditions are imposed on you (whether by court order, agreement or
277 otherwise) that contradict the conditions of this License, they do not
278 excuse you from the conditions of this License. If you cannot
279 distribute so as to satisfy simultaneously your obligations under this
280 License and any other pertinent obligations, then as a consequence you
281 may not distribute the Program at all. For example, if a patent
282 license would not permit royalty-free redistribution of the Program by
283 all those who receive copies directly or indirectly through you, then
284 the only way you could satisfy both it and this License would be to
285 refrain entirely from distribution of the Program.
286 <P>
287
288 If any portion of this section is held invalid or unenforceable under
289 any particular circumstance, the balance of the section is intended to
290 apply and the section as a whole is intended to apply in other
291 circumstances.
292 <P>
293
294 It is not the purpose of this section to induce you to infringe any
295 patents or other property right claims or to contest validity of any
296 such claims; this section has the sole purpose of protecting the
297 integrity of the free software distribution system, which is
298 implemented by public license practices. Many people have made
299 generous contributions to the wide range of software distributed
300 through that system in reliance on consistent application of that
301 system; it is up to the author/donor to decide if he or she is willing
302 to distribute software through any other system and a licensee cannot
303 impose that choice.
304 <P>
305
306 This section is intended to make thoroughly clear what is believed to
307 be a consequence of the rest of this License.
308
309 <P>
310
311 <STRONG>8.</STRONG>
312 If the distribution and/or use of the Program is restricted in
313 certain countries either by patents or by copyrighted interfaces, the
314 original copyright holder who places the Program under this License
315 may add an explicit geographical distribution limitation excluding
316 those countries, so that distribution is permitted only in or among
317 countries not thus excluded. In such case, this License incorporates
318 the limitation as if written in the body of this License.
319
320 <P>
321
322 <STRONG>9.</STRONG>
323 The Free Software Foundation may publish revised and/or new versions
324 of the General Public License from time to time. Such new versions will
325 be similar in spirit to the present version, but may differ in detail to
326 address new problems or concerns.
327 <P>
328
329 Each version is given a distinguishing version number. If the Program
330 specifies a version number of this License which applies to it and "any
331 later version", you have the option of following the terms and conditions
332 either of that version or of any later version published by the Free
333 Software Foundation. If the Program does not specify a version number of
334 this License, you may choose any version ever published by the Free Software
335 Foundation.
336
337 <P>
338
339
340 <STRONG>10.</STRONG>
341 If you wish to incorporate parts of the Program into other free
342 programs whose distribution conditions are different, write to the author
343 to ask for permission. For software which is copyrighted by the Free
344 Software Foundation, write to the Free Software Foundation; we sometimes
345 make exceptions for this. Our decision will be guided by the two goals
346 of preserving the free status of all derivatives of our free software and
347 of promoting the sharing and reuse of software generally.
348
349
350
351 <P><STRONG>NO WARRANTY</STRONG></P>
352
353 <P>
354
355 <STRONG>11.</STRONG>
356 BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
357 FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN
358 OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
359 PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
360 OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
361 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS
362 TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE
363 PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
364 REPAIR OR CORRECTION.
365
366 <P>
367
368 <STRONG>12.</STRONG>
369 IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
370 WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
371 REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
372 INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
373 OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
374 TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
375 YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
376 PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
377 POSSIBILITY OF SUCH DAMAGES.
378
379 <P>
380
381
382 <H2>END OF TERMS AND CONDITIONS</H2>
383
384 <HR>
385
386 <p>Visit the <a href="http://www.gnu.org/home.html">Free Software Foundation</a>.
387 </BODY>
388 </HTML>
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