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