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    1 
    2 		    GNU GENERAL PUBLIC LICENSE
    3 		     Version 1, February 1989
    4 
    5  Copyright (C) 1989 Free Software Foundation, Inc.
    6                     675 Mass Ave, Cambridge, MA 02139, USA
    7  Everyone is permitted to copy and distribute verbatim copies
    8  of this license document, but changing it is not allowed.
    9 
   10 			    Preamble
   11 
   12   The license agreements of most software companies try to keep users
   13 at the mercy of those companies.  By contrast, our General Public
   14 License is intended to guarantee your freedom to share and change free
   15 software--to make sure the software is free for all its users.  The
   16 General Public License applies to the Free Software Foundation's
   17 software and to any other program whose authors commit to using it.
   18 You can use it for your programs, too.
   19 
   20   When we speak of free software, we are referring to freedom, not
   21 price.  Specifically, the General Public License is designed to make
   22 sure that you have the freedom to give away or sell copies of free
   23 software, that you receive source code or can get it if you want it,
   24 that you can change the software or use pieces of it in new free
   25 programs; and that you know you can do these things.
   26 
   27   To protect your rights, we need to make restrictions that forbid
   28 anyone to deny you these rights or to ask you to surrender the rights.
   29 These restrictions translate to certain responsibilities for you if you
   30 distribute copies of the software, or if you modify it.
   31 
   32   For example, if you distribute copies of a such a program, whether
   33 gratis or for a fee, you must give the recipients all the rights that
   34 you have.  You must make sure that they, too, receive or can get the
   35 source code.  And you must tell them their rights.
   36 
   37   We protect your rights with two steps: (1) copyright the software, and
   38 (2) offer you this license which gives you legal permission to copy,
   39 distribute and/or modify the software.
   40 
   41   Also, for each author's protection and ours, we want to make certain
   42 that everyone understands that there is no warranty for this free
   43 software.  If the software is modified by someone else and passed on, we
   44 want its recipients to know that what they have is not the original, so
   45 that any problems introduced by others will not reflect on the original
   46 authors' reputations.
   47 
   48   The precise terms and conditions for copying, distribution and
   49 modification follow.
   50 
   51 		    GNU GENERAL PUBLIC LICENSE
   52    TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
   53 
   54   0. This License Agreement applies to any program or other work which
   55 contains a notice placed by the copyright holder saying it may be
   56 distributed under the terms of this General Public License.  The
   57 "Program", below, refers to any such program or work, and a "work based
   58 on the Program" means either the Program or any work containing the
   59 Program or a portion of it, either verbatim or with modifications.  Each
   60 licensee is addressed as "you".
   61 
   62   1. You may copy and distribute verbatim copies of the Program's source
   63 code as you receive it, in any medium, provided that you conspicuously and
   64 appropriately publish on each copy an appropriate copyright notice and
   65 disclaimer of warranty; keep intact all the notices that refer to this
   66 General Public License and to the absence of any warranty; and give any
   67 other recipients of the Program a copy of this General Public License
   68 along with the Program.  You may charge a fee for the physical act of
   69 transferring a copy.
   70 
   71   2. You may modify your copy or copies of the Program or any portion of
   72 it, and copy and distribute such modifications under the terms of Paragraph
   73 1 above, provided that you also do the following:
   74 
   75     a) cause the modified files to carry prominent notices stating that
   76     you changed the files and the date of any change; and
   77 
   78     b) cause the whole of any work that you distribute or publish, that
   79     in whole or in part contains the Program or any part thereof, either
   80     with or without modifications, to be licensed at no charge to all
   81     third parties under the terms of this General Public License (except
   82     that you may choose to grant warranty protection to some or all
   83     third parties, at your option).
   84 
   85     c) If the modified program normally reads commands interactively when
   86     run, you must cause it, when started running for such interactive use
   87     in the simplest and most usual way, to print or display an
   88     announcement including an appropriate copyright notice and a notice
   89     that there is no warranty (or else, saying that you provide a
   90     warranty) and that users may redistribute the program under these
   91     conditions, and telling the user how to view a copy of this General
   92     Public License.
   93 
   94     d) You may charge a fee for the physical act of transferring a
   95     copy, and you may at your option offer warranty protection in
   96     exchange for a fee.
   97 
   98 Mere aggregation of another independent work with the Program (or its
   99 derivative) on a volume of a storage or distribution medium does not bring
  100 the other work under the scope of these terms.
  101 
  102   3. You may copy and distribute the Program (or a portion or derivative of
  103 it, under Paragraph 2) in object code or executable form under the terms of
  104 Paragraphs 1 and 2 above provided that you also do one of the following:
  105 
  106     a) accompany it with the complete corresponding machine-readable
  107     source code, which must be distributed under the terms of
  108     Paragraphs 1 and 2 above; or,
  109 
  110     b) accompany it with a written offer, valid for at least three
  111     years, to give any third party free (except for a nominal charge
  112     for the cost of distribution) a complete machine-readable copy of the
  113     corresponding source code, to be distributed under the terms of
  114     Paragraphs 1 and 2 above; or,
  115 
  116     c) accompany it with the information you received as to where the
  117     corresponding source code may be obtained.  (This alternative is
  118     allowed only for noncommercial distribution and only if you
  119     received the program in object code or executable form alone.)
  120 
  121 Source code for a work means the preferred form of the work for making
  122 modifications to it.  For an executable file, complete source code means
  123 all the source code for all modules it contains; but, as a special
  124 exception, it need not include source code for modules which are standard
  125 libraries that accompany the operating system on which the executable
  126 file runs, or for standard header files or definitions files that
  127 accompany that operating system.
  128 
  129   4. You may not copy, modify, sublicense, distribute or transfer the
  130 Program except as expressly provided under this General Public License.
  131 Any attempt otherwise to copy, modify, sublicense, distribute or transfer
  132 the Program is void, and will automatically terminate your rights to use
  133 the Program under this License.  However, parties who have received
  134 copies, or rights to use copies, from you under this General Public
  135 License will not have their licenses terminated so long as such parties
  136 remain in full compliance.
  137 
  138   5. By copying, distributing or modifying the Program (or any work based
  139 on the Program) you indicate your acceptance of this license to do so,
  140 and all its terms and conditions.
  141 
  142   6. Each time you redistribute the Program (or any work based on the
  143 Program), the recipient automatically receives a license from the original
  144 licensor to copy, distribute or modify the Program subject to these
  145 terms and conditions.  You may not impose any further restrictions on the
  146 recipients' exercise of the rights granted herein.
  147 
  148   7. The Free Software Foundation may publish revised and/or new versions
  149 of the General Public License from time to time.  Such new versions will
  150 be similar in spirit to the present version, but may differ in detail to
  151 address new problems or concerns.
  152 
  153 Each version is given a distinguishing version number.  If the Program
  154 specifies a version number of the license which applies to it and "any
  155 later version", you have the option of following the terms and conditions
  156 either of that version or of any later version published by the Free
  157 Software Foundation.  If the Program does not specify a version number of
  158 the license, you may choose any version ever published by the Free Software
  159 Foundation.
  160 
  161   8. If you wish to incorporate parts of the Program into other free
  162 programs whose distribution conditions are different, write to the author
  163 to ask for permission.  For software which is copyrighted by the Free
  164 Software Foundation, write to the Free Software Foundation; we sometimes
  165 make exceptions for this.  Our decision will be guided by the two goals
  166 of preserving the free status of all derivatives of our free software and
  167 of promoting the sharing and reuse of software generally.
  168 
  169 			    NO WARRANTY
  170 
  171   9. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
  172 FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
  173 OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
  174 PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
  175 OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  176 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
  177 TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
  178 PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
  179 REPAIR OR CORRECTION.
  180 
  181   10. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
  182 WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
  183 REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
  184 INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
  185 OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
  186 TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
  187 YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
  188 PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
  189 POSSIBILITY OF SUCH DAMAGES.
  190 
  191 		     END OF TERMS AND CONDITIONS
  192 
  193 	Appendix: How to Apply These Terms to Your New Programs
  194 
  195   If you develop a new program, and you want it to be of the greatest
  196 possible use to humanity, the best way to achieve this is to make it
  197 free software which everyone can redistribute and change under these
  198 terms.
  199 
  200   To do so, attach the following notices to the program.  It is safest to
  201 attach them to the start of each source file to most effectively convey
  202 the exclusion of warranty; and each file should have at least the
  203 "copyright" line and a pointer to where the full notice is found.
  204 
  205     <one line to give the program's name and a brief idea of what it does.>
  206     Copyright (C) 19yy  <name of author>
  207 
  208     This program is free software; you can redistribute it and/or modify
  209     it under the terms of the GNU General Public License as published by
  210     the Free Software Foundation; either version 1, or (at your option)
  211     any later version.
  212 
  213     This program is distributed in the hope that it will be useful,
  214     but WITHOUT ANY WARRANTY; without even the implied warranty of
  215     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  216     GNU General Public License for more details.
  217 
  218     You should have received a copy of the GNU General Public License
  219     along with this program; if not, write to the Free Software
  220     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  221 
  222 Also add information on how to contact you by electronic and paper mail.
  223 
  224 If the program is interactive, make it output a short notice like this
  225 when it starts in an interactive mode:
  226 
  227     Gnomovision version 69, Copyright (C) 19xx name of author
  228     Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
  229     This is free software, and you are welcome to redistribute it
  230     under certain conditions; type `show c' for details.
  231 
  232 The hypothetical commands `show w' and `show c' should show the
  233 appropriate parts of the General Public License.  Of course, the
  234 commands you use may be called something other than `show w' and `show
  235 c'; they could even be mouse-clicks or menu items--whatever suits your
  236 program.
  237 
  238 You should also get your employer (if you work as a programmer) or your
  239 school, if any, to sign a "copyright disclaimer" for the program, if
  240 necessary.  Here a sample; alter the names:
  241 
  242   Yoyodyne, Inc., hereby disclaims all copyright interest in the
  243   program `Gnomovision' (a program to direct compilers to make passes
  244   at assemblers) written by James Hacker.
  245 
  246   <signature of Ty Coon>, 1 April 1989
  247   Ty Coon, President of Vice
  248 
  249 That's all there is to it!
  250