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  1.  
  2.                     GNU GENERAL PUBLIC LICENSE
  3.  
  4.                        Version 2, June 1991
  5.  
  6.  
  7.  Copyright (C) 1989, 1991 Free Software Foundation, Inc.
  8.                           675 Mass Ave, Cambridge, MA 02139, USA
  9.  
  10.  Everyone is permitted to copy and distribute verbatim copies
  11.  of this license document, but changing it is not allowed.
  12.  
  13.  
  14.                             Preamble
  15.  
  16.   The licenses for most software are designed to take away your
  17. freedom to share and change it.  By contrast, the GNU General Public
  18. License is intended to guarantee your freedom to share and change free
  19. software--to make sure the software is free for all its users.  This
  20. General Public License applies to most of the Free Software
  21. Foundation's software and to any other program whose authors commit to
  22. using it.  (Some other Free Software Foundation software is covered by
  23. the GNU Library General Public License instead.)  You can apply it to
  24. your programs, too.
  25.  
  26.   When we speak of free software, we are referring to freedom, not
  27. price.  Our General Public Licenses are designed to make sure that you
  28. have the freedom to distribute copies of free software (and charge for
  29. this service if you wish), that you receive source code or can get it
  30. if you want it, that you can change the software or use pieces of it
  31. in new free programs; and that you know you can do these things.
  32.  
  33.   To protect your rights, we need to make restrictions that forbid
  34. anyone to deny you these rights or to ask you to surrender the rights.
  35. These restrictions translate to certain responsibilities for you if you
  36. distribute copies of the software, or if you modify it.
  37.  
  38.   For example, if you distribute copies of such a program, whether
  39. gratis or for a fee, you must give the recipients all the rights that
  40. you have.  You must make sure that they, too, receive or can get the
  41. source code.  And you must show them these terms so they know their
  42. rights.
  43.  
  44.   We protect your rights with two steps: (1) copyright the software, and
  45. (2) offer you this license which gives you legal permission to copy,
  46. distribute and/or modify the software.
  47.  
  48.   Also, for each author's protection and ours, we want to make certain
  49. that everyone understands that there is no warranty for this free
  50. software.  If the software is modified by someone else and passed on, we
  51. want its recipients to know that what they have is not the original, so
  52. that any problems introduced by others will not reflect on the original
  53. authors' reputations.
  54.  
  55.   Finally, any free program is threatened constantly by software
  56. patents.  We wish to avoid the danger that redistributors of a free
  57. program will individually obtain patent licenses, in effect making the
  58. program proprietary.  To prevent this, we have made it clear that any
  59. patent must be licensed for everyone's free use or not licensed at all.
  60.  
  61.   The precise terms and conditions for copying, distribution and
  62. modification follow.
  63.  
  64.  
  65.                   GNU GENERAL PUBLIC LICENSE
  66.  
  67.    TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
  68.  
  69.  
  70.   0. This License applies to any program or other work which contains
  71. a notice placed by the copyright holder saying it may be distributed
  72. under the terms of this General Public License.  The "Program", below,
  73. refers to any such program or work, and a "work based on the Program"
  74. means either the Program or any derivative work under copyright law:
  75. that is to say, a work containing the Program or a portion of it,
  76. either verbatim or with modifications and/or translated into another
  77. language.  (Hereinafter, translation is included without limitation in
  78. the term "modification".)  Each licensee is addressed as "you".
  79.  
  80. Activities other than copying, distribution and modification are not
  81. covered by this License; they are outside its scope.  The act of
  82. running the Program is not restricted, and the output from the Program
  83. is covered only if its contents constitute a work based on the
  84. Program (independent of having been made by running the Program).
  85. Whether that is true depends on what the Program does.
  86.  
  87.   1. You may copy and distribute verbatim copies of the Program's
  88. source code as you receive it, in any medium, provided that you
  89. conspicuously and appropriately publish on each copy an appropriate
  90. copyright notice and disclaimer of warranty; keep intact all the
  91. notices that refer to this License and to the absence of any warranty;
  92. and give any other recipients of the Program a copy of this License
  93. along with the Program.
  94.  
  95. You may charge a fee for the physical act of transferring a copy, and
  96. you may at your option offer warranty protection in exchange for a fee.
  97.  
  98.   2. You may modify your copy or copies of the Program or any portion
  99. of it, thus forming a work based on the Program, and copy and
  100. distribute such modifications or work under the terms of Section 1
  101. above, provided that you also meet all of these conditions:
  102.  
  103.     a) You must cause the modified files to carry prominent notices
  104.     stating that you changed the files and the date of any change.
  105.  
  106.     b) You must cause any work that you distribute or publish, that in
  107.     whole or in part contains or is derived from the Program or any
  108.     part thereof, to be licensed as a whole at no charge to all third
  109.     parties under the terms of this License.
  110.  
  111.     c) If the modified program normally reads commands interactively
  112.     when run, you must cause it, when started running for such
  113.     interactive use in the most ordinary way, to print or display an
  114.     announcement including an appropriate copyright notice and a
  115.     notice that there is no warranty (or else, saying that you provide
  116.     a warranty) and that users may redistribute the program under
  117.     these conditions, and telling the user how to view a copy of this
  118.     License.  (Exception: if the Program itself is interactive but
  119.     does not normally print such an announcement, your work based on
  120.     the Program is not required to print an announcement.)
  121.  
  122. These requirements apply to the modified work as a whole.  If
  123. identifiable sections of that work are not derived from the Program,
  124. and can be reasonably considered independent and separate works in
  125. themselves, then this License, and its terms, do not apply to those
  126. sections when you distribute them as separate works.  But when you
  127. distribute the same sections as part of a whole which is a work based
  128. on the Program, the distribution of the whole must be on the terms of
  129. this License, whose permissions for other licensees extend to the
  130. entire whole, and thus to each and every part regardless of who wrote it.
  131.  
  132. Thus, it is not the intent of this section to claim rights or contest
  133. your rights to work written entirely by you; rather, the intent is to
  134. exercise the right to control the distribution of derivative or
  135. collective works based on the Program.
  136.  
  137. In addition, mere aggregation of another work not based on the Program
  138. with the Program (or with a work based on the Program) on a volume of
  139. a storage or distribution medium does not bring the other work under
  140. 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 of
  144. Sections 1 and 2 above provided that you also do one of the following:
  145.  
  146.     a) Accompany it with the complete corresponding machine-readable
  147.     source code, which must be distributed under the terms of Sections
  148.     1 and 2 above on a medium customarily used for software interchange; or,
  149.  
  150.     b) Accompany it with a written offer, valid for at least three
  151.     years, to give any third party, for a charge no more than your
  152.     cost of physically performing source distribution, a complete
  153.     machine-readable copy of the corresponding source code, to be
  154.     distributed under the terms of Sections 1 and 2 above on a medium
  155.     customarily used for software interchange; or,
  156.  
  157.     c) Accompany it with the information you received as to the offer
  158.     to distribute corresponding source code.  (This alternative is
  159.     allowed only for noncommercial distribution and only if you
  160.     received the program in object code or executable form with such
  161.     an offer, in accord with Subsection b above.)
  162.  
  163. The source code for a work means the preferred form of the work for
  164. making modifications to it.  For an executable work, complete source
  165. code means all the source code for all modules it contains, plus any
  166. associated interface definition files, plus the scripts used to
  167. control compilation and installation of the executable.  However, as a
  168. special exception, the source code distributed need not include
  169. anything that is normally distributed (in either source or binary
  170. form) with the major components (compiler, kernel, and so on) of the
  171. operating system on which the executable runs, unless that component
  172. itself accompanies the executable.
  173.  
  174. If distribution of executable or object code is made by offering
  175. access to copy from a designated place, then offering equivalent
  176. access to copy the source code from the same place counts as
  177. distribution of the source code, even though third parties are not
  178. compelled to copy the source along with the object code.
  179.  
  180.   4. You may not copy, modify, sublicense, or distribute the Program
  181. except as expressly provided under this License.  Any attempt
  182. otherwise to copy, modify, sublicense or distribute the Program is
  183. void, and will automatically terminate your rights under this License.
  184. However, parties who have received copies, or rights, from you under
  185. this License will not have their licenses terminated so long as such
  186. parties remain in full compliance.
  187.  
  188.   5. You are not required to accept this License, since you have not
  189. signed it.  However, nothing else grants you permission to modify or
  190. distribute the Program or its derivative works.  These actions are
  191. prohibited by law if you do not accept this License.  Therefore, by
  192. modifying or distributing the Program (or any work based on the
  193. Program), you indicate your acceptance of this License to do so, and
  194. all its terms and conditions for copying, distributing or modifying
  195. the Program or works based on it.
  196.  
  197.   6. Each time you redistribute the Program (or any work based on the
  198. Program), the recipient automatically receives a license from the
  199. original licensor to copy, distribute or modify the Program subject to
  200. these terms and conditions.  You may not impose any further
  201. restrictions on the recipients' exercise of the rights granted herein.
  202. You are not responsible for enforcing compliance by third parties to
  203. this License.
  204.  
  205.   7. If, as a consequence of a court judgment or allegation of patent
  206. infringement or for any other reason (not limited to patent issues),
  207. conditions are imposed on you (whether by court order, agreement or
  208. otherwise) that contradict the conditions of this License, they do not
  209. excuse you from the conditions of this License.  If you cannot
  210. distribute so as to satisfy simultaneously your obligations under this
  211. License and any other pertinent obligations, then as a consequence you
  212. may not distribute the Program at all.  For example, if a patent
  213. license would not permit royalty-free redistribution of the Program by
  214. all those who receive copies directly or indirectly through you, then
  215. the only way you could satisfy both it and this License would be to
  216. refrain entirely from distribution of the Program.
  217.  
  218. If any portion of this section is held invalid or unenforceable under
  219. any particular circumstance, the balance of the section is intended to
  220. apply and the section as a whole is intended to apply in other
  221. circumstances.
  222.  
  223. It is not the purpose of this section to induce you to infringe any
  224. patents or other property right claims or to contest validity of any
  225. such claims; this section has the sole purpose of protecting the
  226. integrity of the free software distribution system, which is
  227. implemented by public license practices.  Many people have made
  228. generous contributions to the wide range of software distributed
  229. through that system in reliance on consistent application of that
  230. system; it is up to the author/donor to decide if he or she is willing
  231. to distribute software through any other system and a licensee cannot
  232. impose that choice.
  233.  
  234. This section is intended to make thoroughly clear what is believed to
  235. be a consequence of the rest of this License.
  236.  
  237.   8. If the distribution and/or use of the Program is restricted in
  238. certain countries either by patents or by copyrighted interfaces, the
  239. original copyright holder who places the Program under this License
  240. may add an explicit geographical distribution limitation excluding
  241. those countries, so that distribution is permitted only in or among
  242. countries not thus excluded.  In such case, this License incorporates
  243. the limitation as if written in the body of this License.
  244.  
  245.   9. The Free Software Foundation may publish revised and/or new versions
  246. of the General Public License from time to time.  Such new versions will
  247. be similar in spirit to the present version, but may differ in detail to
  248. address new problems or concerns.
  249.  
  250. Each version is given a distinguishing version number.  If the Program
  251. specifies a version number of this License which applies to it and "any
  252. later version", you have the option of following the terms and conditions
  253. either of that version or of any later version published by the Free
  254. Software Foundation.  If the Program does not specify a version number of
  255. this License, you may choose any version ever published by the Free Software
  256. Foundation.
  257.  
  258.   10. If you wish to incorporate parts of the Program into other free
  259. programs whose distribution conditions are different, write to the author
  260. to ask for permission.  For software which is copyrighted by the Free
  261. Software Foundation, write to the Free Software Foundation; we sometimes
  262. make exceptions for this.  Our decision will be guided by the two goals
  263. of preserving the free status of all derivatives of our free software and
  264. of promoting the sharing and reuse of software generally.
  265.  
  266.        NO WARRANTY
  267.  
  268.   11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
  269. FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
  270. OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
  271. PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
  272. OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  273. MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
  274. TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
  275. PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
  276. REPAIR OR CORRECTION.
  277.  
  278.   12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
  279. WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
  280. REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
  281. INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
  282. OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
  283. TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
  284. YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
  285. PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
  286. POSSIBILITY OF SUCH DAMAGES.
  287.  
  288.          END OF TERMS AND CONDITIONS
  289.  
  290.  Appendix: How to Apply These Terms to Your New Programs
  291.  
  292.   If you develop a new program, and you want it to be of the greatest
  293. possible use to the public, the best way to achieve this is to make it
  294. free software which everyone can redistribute and change under these terms.
  295.  
  296.   To do so, attach the following notices to the program.  It is safest
  297. to attach them to the start of each source file to most effectively
  298. convey the exclusion of warranty; and each file should have at least
  299. the "copyright" line and a pointer to where the full notice is found.
  300.  
  301.     <one line to give the program's name and a brief idea of what it does.>
  302.     Copyright (C) 19yy  <name of author>
  303.  
  304.     This program is free software; you can redistribute it and/or modify
  305.     it under the terms of the GNU General Public License as published by
  306.     the Free Software Foundation; either version 2 of the License, or
  307.     (at your option) any later version.
  308.  
  309.     This program is distributed in the hope that it will be useful,
  310.     but WITHOUT ANY WARRANTY; without even the implied warranty of
  311.     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  312.     GNU General Public License for more details.
  313.  
  314.     You should have received a copy of the GNU General Public License
  315.     along with this program; if not, write to the Free Software
  316.     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  317.  
  318. Also add information on how to contact you by electronic and paper mail.
  319.  
  320. If the program is interactive, make it output a short notice like this
  321. when it starts in an interactive mode:
  322.  
  323.     Gnomovision version 69, Copyright (C) 19yy name of author
  324.     Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
  325.     This is free software, and you are welcome to redistribute it
  326.     under certain conditions; type `show c' for details.
  327.  
  328. The hypothetical commands `show w' and `show c' should show the appropriate
  329. parts of the General Public License.  Of course, the commands you use may
  330. be called something other than `show w' and `show c'; they could even be
  331. mouse-clicks or menu items--whatever suits your program.
  332.  
  333. You should also get your employer (if you work as a programmer) or your
  334. school, if any, to sign a "copyright disclaimer" for the program, if
  335. necessary.  Here is a sample; alter the names:
  336.  
  337.   Yoyodyne, Inc., hereby disclaims all copyright interest in the program
  338.   `Gnomovision' (which makes passes at compilers) written by James Hacker.
  339.  
  340.   <signature of Ty Coon>, 1 April 1989
  341.   Ty Coon, President of Vice
  342.  
  343. This General Public License does not permit incorporating your program into
  344. proprietary programs.  If your program is a subroutine library, you may
  345. consider it more useful to permit linking proprietary applications with the
  346. library.  If this is what you want to do, use the GNU Library General
  347. Public License instead of this License.
  348.