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