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11 <h1>GNU GENERAL PUBLIC LICENSE</h1>
12 <h3>Version 2, June 1991</h3>
14 Copyright (C) 1989, 1991 Free Software Foundation, Inc.
15 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
17 Everyone is permitted to copy and distribute verbatim copies
18 of this license document, but changing it is not allowed.
25 The licenses for most software are designed to take away your
26 freedom to share and change it. By contrast, the GNU General Public
27 License is intended to guarantee your freedom to share and change free
28 software--to make sure the software is free for all its users. This
29 General Public License applies to most of the Free Software
30 Foundation's software and to any other program whose authors commit to
31 using it. (Some other Free Software Foundation software is covered by
32 the GNU Library General Public License instead.) You can apply it to
37 When we speak of free software, we are referring to freedom, not
38 price. Our General Public Licenses are designed to make sure that you
39 have the freedom to distribute copies of free software (and charge for
40 this service if you wish), that you receive source code or can get it
41 if you want it, that you can change the software or use pieces of it
42 in new free programs; and that you know you can do these things.
46 To protect your rights, we need to make restrictions that forbid
47 anyone to deny you these rights or to ask you to surrender the rights.
48 These restrictions translate to certain responsibilities for you if you
49 distribute copies of the software, or if you modify it.
53 For example, if you distribute copies of such a program, whether
54 gratis or for a fee, you must give the recipients all the rights that
55 you have. You must make sure that they, too, receive or can get the
56 source code. And you must show them these terms so they know their
61 We protect your rights with two steps: (1) copyright the software, and
62 (2) offer you this license which gives you legal permission to copy,
63 distribute and/or modify the software.
67 Also, for each author's protection and ours, we want to make certain
68 that everyone understands that there is no warranty for this free
69 software. If the software is modified by someone else and passed on, we
70 want its recipients to know that what they have is not the original, so
71 that any problems introduced by others will not reflect on the original
76 Finally, any free program is threatened constantly by software
77 patents. We wish to avoid the danger that redistributors of a free
78 program will individually obtain patent licenses, in effect making the
79 program proprietary. To prevent this, we have made it clear that any
80 patent must be licensed for everyone's free use or not licensed at all.
84 The precise terms and conditions for copying, distribution and
90 <H4>TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION</H4>
96 This License applies to any program or other work which contains
97 a notice placed by the copyright holder saying it may be distributed
98 under the terms of this General Public License. The "Program", below,
99 refers to any such program or work, and a "work based on the Program"
100 means either the Program or any derivative work under copyright law:
101 that is to say, a work containing the Program or a portion of it,
102 either verbatim or with modifications and/or translated into another
103 language. (Hereinafter, translation is included without limitation in
104 the term "modification".) Each licensee is addressed as "you".
107 Activities other than copying, distribution and modification are not
108 covered by this License; they are outside its scope. The act of
109 running the Program is not restricted, and the output from the Program
110 is covered only if its contents constitute a work based on the
111 Program (independent of having been made by running the Program).
112 Whether that is true depends on what the Program does.
117 You may copy and distribute verbatim copies of the Program's
118 source code as you receive it, in any medium, provided that you
119 conspicuously and appropriately publish on each copy an appropriate
120 copyright notice and disclaimer of warranty; keep intact all the
121 notices that refer to this License and to the absence of any warranty;
122 and give any other recipients of the Program a copy of this License
123 along with the Program.
126 You may charge a fee for the physical act of transferring a copy, and
127 you may at your option offer warranty protection in exchange for a fee.
131 You may modify your copy or copies of the Program or any portion
132 of it, thus forming a work based on the Program, and copy and
133 distribute such modifications or work under the terms of Section 1
134 above, provided that you also meet all of these conditions:
139 <LI><STRONG>a)</STRONG>
140 You must cause the modified files to carry prominent notices
141 stating that you changed the files and the date of any change.
144 <LI><STRONG>b)</STRONG>
145 You must cause any work that you distribute or publish, that in
146 whole or in part contains or is derived from the Program or any
147 part thereof, to be licensed as a whole at no charge to all third
148 parties under the terms of this License.
151 <LI><STRONG>c)</STRONG>
152 If the modified program normally reads commands interactively
153 when run, you must cause it, when started running for such
154 interactive use in the most ordinary way, to print or display an
155 announcement including an appropriate copyright notice and a
156 notice that there is no warranty (or else, saying that you provide
157 a warranty) and that users may redistribute the program under
158 these conditions, and telling the user how to view a copy of this
159 License. (Exception: if the Program itself is interactive but
160 does not normally print such an announcement, your work based on
161 the Program is not required to print an announcement.)
164 These requirements apply to the modified work as a whole. If
165 identifiable sections of that work are not derived from the Program,
166 and can be reasonably considered independent and separate works in
167 themselves, then this License, and its terms, do not apply to those
168 sections when you distribute them as separate works. But when you
169 distribute the same sections as part of a whole which is a work based
170 on the Program, the distribution of the whole must be on the terms of
171 this License, whose permissions for other licensees extend to the
172 entire whole, and thus to each and every part regardless of who wrote it.
175 Thus, it is not the intent of this section to claim rights or contest
176 your rights to work written entirely by you; rather, the intent is to
177 exercise the right to control the distribution of derivative or
178 collective works based on the Program.
181 In addition, mere aggregation of another work not based on the Program
182 with the Program (or with a work based on the Program) on a volume of
183 a storage or distribution medium does not bring the other work under
184 the scope of this License.
189 You may copy and distribute the Program (or a work based on it,
190 under Section 2) in object code or executable form under the terms of
191 Sections 1 and 2 above provided that you also do one of the following:
194 <!-- we use this doubled UL to get the sub-sections indented, -->
195 <!-- while making the bullets as unobvious as possible. -->
198 <LI><STRONG>a)</STRONG>
199 Accompany it with the complete corresponding machine-readable
200 source code, which must be distributed under the terms of Sections
201 1 and 2 above on a medium customarily used for software interchange; or,
204 <LI><STRONG>b)</STRONG>
205 Accompany it with a written offer, valid for at least three
206 years, to give any third party, for a charge no more than your
207 cost of physically performing source distribution, a complete
208 machine-readable copy of the corresponding source code, to be
209 distributed under the terms of Sections 1 and 2 above on a medium
210 customarily used for software interchange; or,
213 <LI><STRONG>c)</STRONG>
214 Accompany it with the information you received as to the offer
215 to distribute corresponding source code. (This alternative is
216 allowed only for noncommercial distribution and only if you
217 received the program in object code or executable form with such
218 an offer, in accord with Subsection b above.)
221 The source code for a work means the preferred form of the work for
222 making modifications to it. For an executable work, complete source
223 code means all the source code for all modules it contains, plus any
224 associated interface definition files, plus the scripts used to
225 control compilation and installation of the executable. However, as a
226 special exception, the source code distributed need not include
227 anything that is normally distributed (in either source or binary
228 form) with the major components (compiler, kernel, and so on) of the
229 operating system on which the executable runs, unless that component
230 itself accompanies the executable.
233 If distribution of executable or object code is made by offering
234 access to copy from a designated place, then offering equivalent
235 access to copy the source code from the same place counts as
236 distribution of the source code, even though third parties are not
237 compelled to copy the source along with the object code.
241 You may not copy, modify, sublicense, or distribute the Program
242 except as expressly provided under this License. Any attempt
243 otherwise to copy, modify, sublicense or distribute the Program is
244 void, and will automatically terminate your rights under this License.
245 However, parties who have received copies, or rights, from you under
246 this License will not have their licenses terminated so long as such
247 parties remain in full compliance.
252 You are not required to accept this License, since you have not
253 signed it. However, nothing else grants you permission to modify or
254 distribute the Program or its derivative works. These actions are
255 prohibited by law if you do not accept this License. Therefore, by
256 modifying or distributing the Program (or any work based on the
257 Program), you indicate your acceptance of this License to do so, and
258 all its terms and conditions for copying, distributing or modifying
259 the Program or works based on it.
264 Each time you redistribute the Program (or any work based on the
265 Program), the recipient automatically receives a license from the
266 original licensor to copy, distribute or modify the Program subject to
267 these terms and conditions. You may not impose any further
268 restrictions on the recipients' exercise of the rights granted herein.
269 You are not responsible for enforcing compliance by third parties to
275 If, as a consequence of a court judgment or allegation of patent
276 infringement or for any other reason (not limited to patent issues),
277 conditions are imposed on you (whether by court order, agreement or
278 otherwise) that contradict the conditions of this License, they do not
279 excuse you from the conditions of this License. If you cannot
280 distribute so as to satisfy simultaneously your obligations under this
281 License and any other pertinent obligations, then as a consequence you
282 may not distribute the Program at all. For example, if a patent
283 license would not permit royalty-free redistribution of the Program by
284 all those who receive copies directly or indirectly through you, then
285 the only way you could satisfy both it and this License would be to
286 refrain entirely from distribution of the Program.
289 If any portion of this section is held invalid or unenforceable under
290 any particular circumstance, the balance of the section is intended to
291 apply and the section as a whole is intended to apply in other
295 It is not the purpose of this section to induce you to infringe any
296 patents or other property right claims or to contest validity of any
297 such claims; this section has the sole purpose of protecting the
298 integrity of the free software distribution system, which is
299 implemented by public license practices. Many people have made
300 generous contributions to the wide range of software distributed
301 through that system in reliance on consistent application of that
302 system; it is up to the author/donor to decide if he or she is willing
303 to distribute software through any other system and a licensee cannot
307 This section is intended to make thoroughly clear what is believed to
308 be a consequence of the rest of this License.
313 If the distribution and/or use of the Program is restricted in
314 certain countries either by patents or by copyrighted interfaces, the
315 original copyright holder who places the Program under this License
316 may add an explicit geographical distribution limitation excluding
317 those countries, so that distribution is permitted only in or among
318 countries not thus excluded. In such case, this License incorporates
319 the limitation as if written in the body of this License.
324 The Free Software Foundation may publish revised and/or new versions
325 of the General Public License from time to time. Such new versions will
326 be similar in spirit to the present version, but may differ in detail to
327 address new problems or concerns.
330 Each version is given a distinguishing version number. If the Program
331 specifies a version number of this License which applies to it and "any
332 later version", you have the option of following the terms and conditions
333 either of that version or of any later version published by the Free
334 Software Foundation. If the Program does not specify a version number of
335 this License, you may choose any version ever published by the Free Software
342 If you wish to incorporate parts of the Program into other free
343 programs whose distribution conditions are different, write to the author
344 to ask for permission. For software which is copyrighted by the Free
345 Software Foundation, write to the Free Software Foundation; we sometimes
346 make exceptions for this. Our decision will be guided by the two goals
347 of preserving the free status of all derivatives of our free software and
348 of promoting the sharing and reuse of software generally.
352 <P><STRONG>NO WARRANTY</STRONG></P>
357 BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
358 FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN
359 OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
360 PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
361 OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
362 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS
363 TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE
364 PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
365 REPAIR OR CORRECTION.
370 IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
371 WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
372 REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
373 INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
374 OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
375 TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
376 YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
377 PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
378 POSSIBILITY OF SUCH DAMAGES.
383 <H3>END OF TERMS AND CONDITIONS</H3>