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