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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 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
  14. is covered by the GNU Lesser General Public License instead.) You can apply
  15. it to 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
  18. to distribute copies of free software (and charge for this service if you
  19. wish), that you receive source code or can get it if you want it, that you
  20. can change the software or use pieces of it in new free programs; and that
  21. you know you can do these things.
  22. To protect your rights, we need to make restrictions that forbid anyone to
  23. deny 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
  25. the software, or if you modify it.
  26. For example, if you distribute copies of such a program, whether gratis or
  27. for a fee, you must give the recipients all the rights that you have. You
  28. must make sure that they, too, receive or can get the source code. And you
  29. must 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
  35. the software is modified by someone else and passed on, we want its recipients
  36. to 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 individually
  40. obtain patent licenses, in effect making the program proprietary. To prevent
  41. this, we have made it clear that any patent must be licensed for everyone's
  42. 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
  48. of 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 translated
  52. into another language. (Hereinafter, translation is included without limitation
  53. in the term "modification".) Each licensee is addressed as "you".
  54. Activities other than copying, distribution and modification are not covered
  55. by this License; they are outside its scope. The act of running the Program
  56. is not restricted, and the output from the Program is covered only if its
  57. contents constitute a work based on the Program (independent of having been
  58. made by running the Program). Whether that is true depends on what the Program
  59. does.
  60. 1. You may copy and distribute verbatim copies of the Program's source code
  61. as you receive it, in any medium, provided that you conspicuously and appropriately
  62. publish on each copy an appropriate copyright notice and disclaimer of warranty;
  63. keep intact all the notices that refer to this License and to the absence
  64. of any warranty; and give any other recipients of the Program a copy of this
  65. License along with the Program.
  66. You may charge a fee for the physical act of transferring a copy, and you
  67. may 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,
  69. thus 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
  71. of these conditions:
  72. a) You must cause the modified files to carry prominent notices stating that
  73. 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 this
  77. 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 most
  80. ordinary way, to print or display an announcement including an appropriate
  81. copyright notice and a notice that there is no warranty (or else, saying that
  82. you provide a warranty) and that users may redistribute the program under
  83. these conditions, and telling the user how to view a copy of this License.
  84. (Exception: if the Program itself is interactive but does not normally print
  85. such an announcement, your work based on the Program is not required to print
  86. 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,
  90. and its terms, do not apply to those sections when you distribute them as
  91. separate works. But when you distribute the same sections as part of a whole
  92. which is a work based on the Program, the distribution of the whole must be
  93. on the terms of this License, whose permissions for other licensees extend
  94. to the entire whole, and thus to each and every part regardless of who wrote
  95. it.
  96. Thus, it is not the intent of this section to claim rights or contest your
  97. rights to work written entirely by you; rather, the intent is to exercise
  98. the right to control the distribution of derivative or collective works based
  99. on the Program.
  100. In addition, mere aggregation of another work not based on the Program with
  101. the Program (or with a work based on the Program) on a volume of a storage
  102. or distribution medium does not bring the other work under the scope of this
  103. License.
  104. 3. You may copy and distribute the Program (or a work based on it, under Section
  105. 2) in object code or executable form under the terms of Sections 1 and 2 above
  106. provided that you also do one of the following:
  107. a) Accompany it with the complete corresponding machine-readable source code,
  108. which must be distributed under the terms of Sections 1 and 2 above on a medium
  109. customarily used for software interchange; or,
  110. b) Accompany it with a written offer, valid for at least three years, to give
  111. any third party, for a charge no more than your cost of physically performing
  112. source distribution, a complete machine-readable copy of the corresponding
  113. source code, to be distributed under the terms of Sections 1 and 2 above on
  114. a medium customarily used for software interchange; or,
  115. c) Accompany it with the information you received as to the offer to distribute
  116. corresponding source code. (This alternative is allowed only for noncommercial
  117. distribution and only if you received the program in object code or executable
  118. form with such an offer, in accord with 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 distributed
  124. need not include anything that is normally distributed (in either source or
  125. binary form) with the major components (compiler, kernel, and so on) of the
  126. operating system on which the executable runs, unless that component itself
  127. accompanies the executable.
  128. If distribution of executable or object code is made by offering access to
  129. copy from a designated place, then offering equivalent access to copy the
  130. source code from the same place counts as distribution of the source code,
  131. even though third parties are not compelled to copy the source along with
  132. the object code.
  133. 4. You may not copy, modify, sublicense, or distribute the Program except
  134. as expressly provided under this License. Any attempt otherwise to copy, modify,
  135. sublicense or distribute the Program is void, and will automatically terminate
  136. your rights under this License. However, parties who have received copies,
  137. or rights, from you under this License will not have their licenses terminated
  138. so long as such parties remain in full compliance.
  139. 5. You are not required to accept this License, since you have not signed
  140. it. However, nothing else grants you permission to modify or distribute the
  141. Program or its derivative works. These actions are prohibited by law if you
  142. do not accept this License. Therefore, by modifying or distributing the Program
  143. (or any work based on the Program), you indicate your acceptance of this License
  144. to do so, and all its terms and conditions for copying, distributing or modifying
  145. the Program or works based on it.
  146. 6. Each time you redistribute the Program (or any work based on the Program),
  147. the recipient automatically receives a license from the original licensor
  148. to copy, distribute or modify the Program subject to these terms and conditions.
  149. You may not impose any further restrictions on the recipients' exercise of
  150. the rights granted herein. You are not responsible for enforcing compliance
  151. by third parties to this License.
  152. 7. If, as a consequence of a court judgment or allegation of patent infringement
  153. or for any other reason (not limited to patent issues), conditions are imposed
  154. on you (whether by court order, agreement or otherwise) that contradict the
  155. conditions of this License, they do not excuse you from the conditions of
  156. this License. If you cannot distribute so as to satisfy simultaneously your
  157. obligations under this License and any other pertinent obligations, then as
  158. a consequence you may not distribute the Program at all. For example, if a
  159. patent license would not permit royalty-free redistribution of the Program
  160. by all those who receive copies directly or indirectly through you, then the
  161. only way you could satisfy both it and this License would be to refrain entirely
  162. from distribution of the Program.
  163. If any portion of this section is held invalid or unenforceable under any
  164. particular circumstance, the balance of the section is intended to apply and
  165. the section as a whole is intended to apply in other circumstances.
  166. It is not the purpose of this section to induce you to infringe any patents
  167. or other property right claims or to contest validity of any such claims;
  168. this section has the sole purpose of protecting the integrity of the free
  169. software distribution system, which is implemented by public license practices.
  170. Many people have made generous contributions to the wide range of software
  171. distributed through that system in reliance on consistent application of that
  172. system; it is up to the author/donor to decide if he or she is willing to
  173. distribute software through any other system and a licensee cannot impose
  174. that choice.
  175. This section is intended to make thoroughly clear what is believed to be a
  176. consequence of the rest of this License.
  177. 8. If the distribution and/or use of the Program is restricted in certain
  178. countries either by patents or by copyrighted interfaces, the original copyright
  179. holder who places the Program under this License may add an explicit geographical
  180. distribution limitation excluding those countries, so that distribution is
  181. permitted only in or among countries not thus excluded. In such case, this
  182. License incorporates the limitation as if written in the body of this License.
  183. 9. The Free Software Foundation may publish revised and/or new versions of
  184. the General Public License from time to time. Such new versions will be similar
  185. in spirit to the present version, but may differ in detail to address new
  186. problems or concerns.
  187. Each version is given a distinguishing version number. If the Program specifies
  188. a version number of this License which applies to it and "any later version",
  189. you have the option of following the terms and conditions either of that version
  190. or of any later version published by the Free Software Foundation. If the
  191. Program does not specify a version number of this License, you may choose
  192. 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
  198. of all derivatives of our free software and of promoting the sharing and reuse
  199. of 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 PROGRAM
  204. "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
  205. BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  206. FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE
  207. OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME
  208. THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
  209. 12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
  210. WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR REDISTRIBUTE
  211. THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
  212. GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE
  213. OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA
  214. OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES
  215. OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH
  216. HOLDER 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 an idea of what it does. >
  227. Copyright (C) < yyyy > < name of author >
  228. This program is free software; you can redistribute it and/or modify it under
  229. the terms of the GNU General Public License as published by the Free Software
  230. Foundation; either version 2 of the License, or (at your option) any later
  231. 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 FITNESS
  234. FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
  235. You should have received a copy of the GNU General Public License along with
  236. this program; if not, write to the Free Software Foundation, Inc., 51 Franklin
  237. Street, Fifth Floor, Boston, MA 02110-1301 , USA.
  238. Also add information on how to contact you by electronic and paper mail.
  239. If the program is interactive, make it output a short notice like this when
  240. it starts in an interactive mode:
  241. Gnomovision version 69, Copyright (C) year name of author Gnomovision comes
  242. with ABSOLUTELY NO WARRANTY; for details type `show w'. This is free software,
  243. and you are welcome to redistribute it under certain conditions; type `show
  244. c' for details.
  245. The hypothetical commands `show w' and `show c' should show the appropriate
  246. parts of the General Public License. Of course, the commands you use may be
  247. called something other than `show w' and `show c'; they could even be mouse-clicks
  248. or menu items--whatever suits your program.
  249. You should also get your employer (if you work as a programmer) or your school,
  250. if any, to sign a "copyright disclaimer" for the program, if necessary. Here
  251. is a sample; alter the names:
  252. Yoyodyne, Inc., hereby disclaims all copyright interest in the program `Gnomovision'
  253. (which makes passes at compilers) written by James Hacker.
  254. < signature of Ty Coon > , 1 April 1989 Ty Coon, President of Vice This General
  255. Public License does not permit incorporating your program into proprietary
  256. programs. If your program is a subroutine library, you may consider it more
  257. useful to permit linking proprietary applications with the library. If this
  258. is what you want to do, use the GNU Lesser General Public License instead
  259. of this License.
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