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