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    1 		    GNU GENERAL PUBLIC LICENSE
    2 		       Version 2, June 1991
    3 
    4  Copyright (C) 1989, 1991 Free Software Foundation, Inc.
    5                           675 Mass Ave, Cambridge, MA 02139, USA
    6  Everyone is permitted to copy and distribute verbatim copies
    7  of this license document, but changing it is not allowed.
    8 
    9 			    Preamble
   10 
   11   The licenses for most software are designed to take away your
   12 freedom to share and change it.  By contrast, the GNU General Public
   13 License is intended to guarantee your freedom to share and change free
   14 software--to make sure the software is free for all its users.  This
   15 General Public License applies to most of the Free Software
   16 Foundation's software and to any other program whose authors commit to
   17 using it.  (Some other Free Software Foundation software is covered by
   18 the GNU Library General Public License instead.)  You can apply it to
   19 your programs, too.
   20 
   21   When we speak of free software, we are referring to freedom, not
   22 price.  Our General Public Licenses are designed to make sure that you
   23 have the freedom to distribute copies of free software (and charge for
   24 this service if you wish), that you receive source code or can get it
   25 if you want it, that you can change the software or use pieces of it
   26 in new free programs; and that you know you can do these things.
   27 
   28   To protect your rights, we need to make restrictions that forbid
   29 anyone to deny you these rights or to ask you to surrender the rights.
   30 These restrictions translate to certain responsibilities for you if you
   31 distribute copies of the software, or if you modify it.
   32 
   33   For example, if you distribute copies of such a program, whether
   34 gratis or for a fee, you must give the recipients all the rights that
   35 you have.  You must make sure that they, too, receive or can get the
   36 source code.  And you must show them these terms so they know their
   37 rights.
   38 
   39   We protect your rights with two steps: (1) copyright the software, and
   40 (2) offer you this license which gives you legal permission to copy,
   41 distribute and/or modify the software.
   42 
   43   Also, for each author's protection and ours, we want to make certain
   44 that everyone understands that there is no warranty for this free
   45 software.  If the software is modified by someone else and passed on, we
   46 want its recipients to know that what they have is not the original, so
   47 that any problems introduced by others will not reflect on the original
   48 authors' reputations.
   49 
   50   Finally, any free program is threatened constantly by software
   51 patents.  We wish to avoid the danger that redistributors of a free
   52 program will individually obtain patent licenses, in effect making the
   53 program proprietary.  To prevent this, we have made it clear that any
   54 patent must be licensed for everyone's free use or not licensed at all.
   55 
   56   The precise terms and conditions for copying, distribution and
   57 modification follow.
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   86 
   87 		    GNU GENERAL PUBLIC LICENSE
   88    TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
   89 
   90   0. This License applies to any program or other work which contains
   91 a notice placed by the copyright holder saying it may be distributed
   92 under the terms of this General Public License.  The "Program", below,
   93 refers to any such program or work, and a "work based on the Program"
   94 means either the Program or any derivative work under copyright law:
   95 that is to say, a work containing the Program or a portion of it,
   96 either verbatim or with modifications and/or translated into another
   97 language.  (Hereinafter, translation is included without limitation in
   98 the term "modification".)  Each licensee is addressed as "you".
   99 
  100 Activities other than copying, distribution and modification are not
  101 covered by this License; they are outside its scope.  The act of
  102 running the Program is not restricted, and the output from the Program
  103 is covered only if its contents constitute a work based on the
  104 Program (independent of having been made by running the Program).
  105 Whether that is true depends on what the Program does.
  106 
  107   1. You may copy and distribute verbatim copies of the Program's
  108 source code as you receive it, in any medium, provided that you
  109 conspicuously and appropriately publish on each copy an appropriate
  110 copyright notice and disclaimer of warranty; keep intact all the
  111 notices that refer to this License and to the absence of any warranty;
  112 and give any other recipients of the Program a copy of this License
  113 along with the Program.
  114 
  115 You may charge a fee for the physical act of transferring a copy, and
  116 you may at your option offer warranty protection in exchange for a fee.
  117 
  118   2. You may modify your copy or copies of the Program or any portion
  119 of it, thus forming a work based on the Program, and copy and
  120 distribute such modifications or work under the terms of Section 1
  121 above, provided that you also meet all of these conditions:
  122 
  123     a) You must cause the modified files to carry prominent notices
  124     stating that you changed the files and the date of any change.
  125 
  126     b) You must cause any work that you distribute or publish, that in
  127     whole or in part contains or is derived from the Program or any
  128     part thereof, to be licensed as a whole at no charge to all third
  129     parties under the terms of this License.
  130 
  131     c) If the modified program normally reads commands interactively
  132     when run, you must cause it, when started running for such
  133     interactive use in the most ordinary way, to print or display an
  134     announcement including an appropriate copyright notice and a
  135     notice that there is no warranty (or else, saying that you provide
  136     a warranty) and that users may redistribute the program under
  137     these conditions, and telling the user how to view a copy of this
  138     License.  (Exception: if the Program itself is interactive but
  139     does not normally print such an announcement, your work based on
  140     the Program is not required to print an announcement.)
  141 
  142 
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  153 
  154 
  155 These requirements apply to the modified work as a whole.  If
  156 identifiable sections of that work are not derived from the Program,
  157 and can be reasonably considered independent and separate works in
  158 themselves, then this License, and its terms, do not apply to those
  159 sections when you distribute them as separate works.  But when you
  160 distribute the same sections as part of a whole which is a work based
  161 on the Program, the distribution of the whole must be on the terms of
  162 this License, whose permissions for other licensees extend to the
  163 entire whole, and thus to each and every part regardless of who wrote it.
  164 
  165 Thus, it is not the intent of this section to claim rights or contest
  166 your rights to work written entirely by you; rather, the intent is to
  167 exercise the right to control the distribution of derivative or
  168 collective works based on the Program.
  169 
  170 In addition, mere aggregation of another work not based on the Program
  171 with the Program (or with a work based on the Program) on a volume of
  172 a storage or distribution medium does not bring the other work under
  173 the scope of this License.
  174 
  175   3. You may copy and distribute the Program (or a work based on it,
  176 under Section 2) in object code or executable form under the terms of
  177 Sections 1 and 2 above provided that you also do one of the following:
  178 
  179     a) Accompany it with the complete corresponding machine-readable
  180     source code, which must be distributed under the terms of Sections
  181     1 and 2 above on a medium customarily used for software interchange; or,
  182 
  183     b) Accompany it with a written offer, valid for at least three
  184     years, to give any third party, for a charge no more than your
  185     cost of physically performing source distribution, a complete
  186     machine-readable copy of the corresponding source code, to be
  187     distributed under the terms of Sections 1 and 2 above on a medium
  188     customarily used for software interchange; or,
  189 
  190     c) Accompany it with the information you received as to the offer
  191     to distribute corresponding source code.  (This alternative is
  192     allowed only for noncommercial distribution and only if you
  193     received the program in object code or executable form with such
  194     an offer, in accord with Subsection b above.)
  195 
  196 The source code for a work means the preferred form of the work for
  197 making modifications to it.  For an executable work, complete source
  198 code means all the source code for all modules it contains, plus any
  199 associated interface definition files, plus the scripts used to
  200 control compilation and installation of the executable.  However, as a
  201 special exception, the source code distributed need not include
  202 anything that is normally distributed (in either source or binary
  203 form) with the major components (compiler, kernel, and so on) of the
  204 operating system on which the executable runs, unless that component
  205 itself accompanies the executable.
  206 
  207 If distribution of executable or object code is made by offering
  208 access to copy from a designated place, then offering equivalent
  209 access to copy the source code from the same place counts as
  210 distribution of the source code, even though third parties are not
  211 compelled to copy the source along with the object code.
  212 
  213 
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  221 
  222 
  223   4. You may not copy, modify, sublicense, or distribute the Program
  224 except as expressly provided under this License.  Any attempt
  225 otherwise to copy, modify, sublicense or distribute the Program is
  226 void, and will automatically terminate your rights under this License.
  227 However, parties who have received copies, or rights, from you under
  228 this License will not have their licenses terminated so long as such
  229 parties remain in full compliance.
  230 
  231   5. You are not required to accept this License, since you have not
  232 signed it.  However, nothing else grants you permission to modify or
  233 distribute the Program or its derivative works.  These actions are
  234 prohibited by law if you do not accept this License.  Therefore, by
  235 modifying or distributing the Program (or any work based on the
  236 Program), you indicate your acceptance of this License to do so, and
  237 all its terms and conditions for copying, distributing or modifying
  238 the Program or works based on it.
  239 
  240   6. Each time you redistribute the Program (or any work based on the
  241 Program), the recipient automatically receives a license from the
  242 original licensor to copy, distribute or modify the Program subject to
  243 these terms and conditions.  You may not impose any further
  244 restrictions on the recipients' exercise of the rights granted herein.
  245 You are not responsible for enforcing compliance by third parties to
  246 this License.
  247 
  248   7. If, as a consequence of a court judgment or allegation of patent
  249 infringement or for any other reason (not limited to patent issues),
  250 conditions are imposed on you (whether by court order, agreement or
  251 otherwise) that contradict the conditions of this License, they do not
  252 excuse you from the conditions of this License.  If you cannot
  253 distribute so as to satisfy simultaneously your obligations under this
  254 License and any other pertinent obligations, then as a consequence you
  255 may not distribute the Program at all.  For example, if a patent
  256 license would not permit royalty-free redistribution of the Program by
  257 all those who receive copies directly or indirectly through you, then
  258 the only way you could satisfy both it and this License would be to
  259 refrain entirely from distribution of the Program.
  260 
  261 If any portion of this section is held invalid or unenforceable under
  262 any particular circumstance, the balance of the section is intended to
  263 apply and the section as a whole is intended to apply in other
  264 circumstances.
  265 
  266 It is not the purpose of this section to induce you to infringe any
  267 patents or other property right claims or to contest validity of any
  268 such claims; this section has the sole purpose of protecting the
  269 integrity of the free software distribution system, which is
  270 implemented by public license practices.  Many people have made
  271 generous contributions to the wide range of software distributed
  272 through that system in reliance on consistent application of that
  273 system; it is up to the author/donor to decide if he or she is willing
  274 to distribute software through any other system and a licensee cannot
  275 impose that choice.
  276 
  277 This section is intended to make thoroughly clear what is believed to
  278 be a consequence of the rest of this License.
  279 
  280 
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  289 
  290 
  291   8. If the distribution and/or use of the Program is restricted in
  292 certain countries either by patents or by copyrighted interfaces, the
  293 original copyright holder who places the Program under this License
  294 may add an explicit geographical distribution limitation excluding
  295 those countries, so that distribution is permitted only in or among
  296 countries not thus excluded.  In such case, this License incorporates
  297 the limitation as if written in the body of this License.
  298 
  299   9. The Free Software Foundation may publish revised and/or new versions
  300 of the General Public License from time to time.  Such new versions will
  301 be similar in spirit to the present version, but may differ in detail to
  302 address new problems or concerns.
  303 
  304 Each version is given a distinguishing version number.  If the Program
  305 specifies a version number of this License which applies to it and "any
  306 later version", you have the option of following the terms and conditions
  307 either of that version or of any later version published by the Free
  308 Software Foundation.  If the Program does not specify a version number of
  309 this License, you may choose any version ever published by the Free Software
  310 Foundation.
  311 
  312   10. If you wish to incorporate parts of the Program into other free
  313 programs whose distribution conditions are different, write to the author
  314 to ask for permission.  For software which is copyrighted by the Free
  315 Software Foundation, write to the Free Software Foundation; we sometimes
  316 make exceptions for this.  Our decision will be guided by the two goals
  317 of preserving the free status of all derivatives of our free software and
  318 of promoting the sharing and reuse of software generally.
  319 
  320 			    NO WARRANTY
  321 
  322   11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
  323 FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
  324 OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
  325 PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
  326 OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  327 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
  328 TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
  329 PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
  330 REPAIR OR CORRECTION.
  331 
  332   12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
  333 WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
  334 REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
  335 INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
  336 OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
  337 TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
  338 YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
  339 PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
  340 POSSIBILITY OF SUCH DAMAGES.
  341 
  342 		     END OF TERMS AND CONDITIONS
  343 
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  358 
  359 	Appendix: How to Apply These Terms to Your New Programs
  360 
  361   If you develop a new program, and you want it to be of the greatest
  362 possible use to the public, the best way to achieve this is to make it
  363 free software which everyone can redistribute and change under these terms.
  364 
  365   To do so, attach the following notices to the program.  It is safest
  366 to attach them to the start of each source file to most effectively
  367 convey the exclusion of warranty; and each file should have at least
  368 the "copyright" line and a pointer to where the full notice is found.
  369 
  370     <one line to give the program's name and a brief idea of what it does.>
  371     Copyright (C) 19yy  <name of author>
  372 
  373     This program is free software; you can redistribute it and/or modify
  374     it under the terms of the GNU General Public License as published by
  375     the Free Software Foundation; either version 2 of the License, or
  376     (at your option) any later version.
  377 
  378     This program is distributed in the hope that it will be useful,
  379     but WITHOUT ANY WARRANTY; without even the implied warranty of
  380     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  381     GNU General Public License for more details.
  382 
  383     You should have received a copy of the GNU General Public License
  384     along with this program; if not, write to the Free Software
  385     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  386 
  387 Also add information on how to contact you by electronic and paper mail.
  388 
  389 If the program is interactive, make it output a short notice like this
  390 when it starts in an interactive mode:
  391 
  392     Gnomovision version 69, Copyright (C) 19yy name of author
  393     Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
  394     This is free software, and you are welcome to redistribute it
  395     under certain conditions; type `show c' for details.
  396 
  397 The hypothetical commands `show w' and `show c' should show the appropriate
  398 parts of the General Public License.  Of course, the commands you use may
  399 be called something other than `show w' and `show c'; they could even be
  400 mouse-clicks or menu items--whatever suits your program.
  401 
  402 You should also get your employer (if you work as a programmer) or your
  403 school, if any, to sign a "copyright disclaimer" for the program, if
  404 necessary.  Here is a sample; alter the names:
  405 
  406   Yoyodyne, Inc., hereby disclaims all copyright interest in the program
  407   `Gnomovision' (which makes passes at compilers) written by James Hacker.
  408 
  409   <signature of Ty Coon>, 1 April 1989
  410   Ty Coon, President of Vice
  411 
  412 This General Public License does not permit incorporating your program into
  413 proprietary programs.  If your program is a subroutine library, you may
  414 consider it more useful to permit linking proprietary applications with the
  415 library.  If this is what you want to do, use the GNU Library General
  416 Public License instead of this License.