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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                     51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
    7 
    8  Everyone is permitted to copy and distribute verbatim copies
    9  of this license document, but changing it is not allowed.
   10 
   11                             Preamble
   12 
   13   The license agreements of most software companies try to keep users
   14 at the mercy of those companies.  By contrast, our General Public
   15 License is intended to guarantee your freedom to share and change free
   16 software--to make sure the software is free for all its users.  The
   17 General Public License applies to the Free Software Foundation's
   18 software and to any other program whose authors commit to using it.
   19 You can use it for your programs, too.
   20 
   21   When we speak of free software, we are referring to freedom, not
   22 price.  Specifically, the General Public License is designed to make
   23 sure that you have the freedom to give away or sell copies of free
   24 software, that you receive source code or can get it if you want it,
   25 that you can change the software or use pieces of it in new free
   26 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 a 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 tell them their rights.
   37 
   38   We protect your rights with two steps: (1) copyright the software, and
   39 (2) offer you this license which gives you legal permission to copy,
   40 distribute and/or modify the software.
   41 
   42   Also, for each author's protection and ours, we want to make certain
   43 that everyone understands that there is no warranty for this free
   44 software.  If the software is modified by someone else and passed on, we
   45 want its recipients to know that what they have is not the original, so
   46 that any problems introduced by others will not reflect on the original
   47 authors' reputations.
   48 
   49   The precise terms and conditions for copying, distribution and
   50 modification follow.
   51 
   52                     GNU GENERAL PUBLIC LICENSE
   53    TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
   54 
   55   0. This License Agreement applies to any program or other work which
   56 contains a notice placed by the copyright holder saying it may be
   57 distributed under the terms of this General Public License.  The
   58 "Program", below, refers to any such program or work, and a "work based
   59 on the Program" means either the Program or any work containing the
   60 Program or a portion of it, either verbatim or with modifications.  Each
   61 licensee is addressed as "you".
   62 
   63   1. You may copy and distribute verbatim copies of the Program's source
   64 code as you receive it, in any medium, provided that you conspicuously and
   65 appropriately publish on each copy an appropriate copyright notice and
   66 disclaimer of warranty; keep intact all the notices that refer to this
   67 General Public License and to the absence of any warranty; and give any
   68 other recipients of the Program a copy of this General Public License
   69 along with the Program.  You may charge a fee for the physical act of
   70 transferring a copy.
   71 
   72   2. You may modify your copy or copies of the Program or any portion of
   73 it, and copy and distribute such modifications under the terms of Paragraph
   74 1 above, provided that you also do the following:
   75 
   76     a) cause the modified files to carry prominent notices stating that
   77     you changed the files and the date of any change; and
   78 
   79     b) cause the whole of any work that you distribute or publish, that
   80     in whole or in part contains the Program or any part thereof, either
   81     with or without modifications, to be licensed at no charge to all
   82     third parties under the terms of this General Public License (except
   83     that you may choose to grant warranty protection to some or all
   84     third parties, at your option).
   85 
   86     c) If the modified program normally reads commands interactively when
   87     run, you must cause it, when started running for such interactive use
   88     in the simplest and most usual way, to print or display an
   89     announcement including an appropriate copyright notice and a notice
   90     that there is no warranty (or else, saying that you provide a
   91     warranty) and that users may redistribute the program under these
   92     conditions, and telling the user how to view a copy of this General
   93     Public License.
   94 
   95     d) You may charge a fee for the physical act of transferring a
   96     copy, and you may at your option offer warranty protection in
   97     exchange for a fee.
   98 
   99 Mere aggregation of another independent work with the Program (or its
  100 derivative) on a volume of a storage or distribution medium does not bring
  101 the other work under the scope of these terms.
  102 
  103   3. You may copy and distribute the Program (or a portion or derivative of
  104 it, under Paragraph 2) in object code or executable form under the terms of
  105 Paragraphs 1 and 2 above provided that you also do one of the following:
  106 
  107     a) accompany it with the complete corresponding machine-readable
  108     source code, which must be distributed under the terms of
  109     Paragraphs 1 and 2 above; or,
  110 
  111     b) accompany it with a written offer, valid for at least three
  112     years, to give any third party free (except for a nominal charge
  113     for the cost of distribution) a complete machine-readable copy of the
  114     corresponding source code, to be distributed under the terms of
  115     Paragraphs 1 and 2 above; or,
  116 
  117     c) accompany it with the information you received as to where the
  118     corresponding source code may be obtained.  (This alternative is
  119     allowed only for noncommercial distribution and only if you
  120     received the program in object code or executable form alone.)
  121 
  122 Source code for a work means the preferred form of the work for making
  123 modifications to it.  For an executable file, complete source code means
  124 all the source code for all modules it contains; but, as a special
  125 exception, it need not include source code for modules which are standard
  126 libraries that accompany the operating system on which the executable
  127 file runs, or for standard header files or definitions files that
  128 accompany that operating system.
  129 
  130   4. You may not copy, modify, sublicense, distribute or transfer the
  131 Program except as expressly provided under this General Public License.
  132 Any attempt otherwise to copy, modify, sublicense, distribute or transfer
  133 the Program is void, and will automatically terminate your rights to use
  134 the Program under this License.  However, parties who have received
  135 copies, or rights to use copies, from you under this General Public
  136 License will not have their licenses terminated so long as such parties
  137 remain in full compliance.
  138 
  139   5. By copying, distributing or modifying the Program (or any work based
  140 on the Program) you indicate your acceptance of this license to do so,
  141 and all its terms and conditions.
  142 
  143   6. Each time you redistribute the Program (or any work based on the
  144 Program), the recipient automatically receives a license from the original
  145 licensor to copy, distribute or modify the Program subject to these
  146 terms and conditions.  You may not impose any further restrictions on the
  147 recipients' exercise of the rights granted herein.
  148 
  149   7. The Free Software Foundation may publish revised and/or new versions
  150 of the General Public License from time to time.  Such new versions will
  151 be similar in spirit to the present version, but may differ in detail to
  152 address new problems or concerns.
  153 
  154 Each version is given a distinguishing version number.  If the Program
  155 specifies a version number of the license which applies to it and "any
  156 later version", you have the option of following the terms and conditions
  157 either of that version or of any later version published by the Free
  158 Software Foundation.  If the Program does not specify a version number of
  159 the license, you may choose any version ever published by the Free Software
  160 Foundation.
  161 
  162   8. If you wish to incorporate parts of the Program into other free
  163 programs whose distribution conditions are different, write to the author
  164 to ask for permission.  For software which is copyrighted by the Free
  165 Software Foundation, write to the Free Software Foundation; we sometimes
  166 make exceptions for this.  Our decision will be guided by the two goals
  167 of preserving the free status of all derivatives of our free software and
  168 of promoting the sharing and reuse of software generally.
  169 
  170                             NO WARRANTY
  171 
  172   9. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
  173 FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
  174 OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
  175 PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
  176 OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  177 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
  178 TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
  179 PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
  180 REPAIR OR CORRECTION.
  181 
  182   10. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
  183 WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
  184 REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
  185 INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
  186 OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
  187 TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
  188 YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
  189 PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
  190 POSSIBILITY OF SUCH DAMAGES.
  191 
  192                      END OF TERMS AND CONDITIONS
  193 
  194         Appendix: How to Apply These Terms to Your New Programs
  195 
  196   If you develop a new program, and you want it to be of the greatest
  197 possible use to humanity, the best way to achieve this is to make it
  198 free software which everyone can redistribute and change under these
  199 terms.
  200 
  201   To do so, attach the following notices to the program.  It is safest to
  202 attach them to the start of each source file to most effectively convey
  203 the exclusion of warranty; and each file should have at least the
  204 "copyright" line and a pointer to where the full notice is found.
  205 
  206     <one line to give the program's name and a brief idea of what it does.>
  207     Copyright (C) 19yy  <name of author>
  208 
  209     This program is free software; you can redistribute it and/or modify
  210     it under the terms of the GNU General Public License as published by
  211     the Free Software Foundation; either version 1, or (at your option)
  212     any later version.
  213 
  214     This program is distributed in the hope that it will be useful,
  215     but WITHOUT ANY WARRANTY; without even the implied warranty of
  216     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  217     GNU General Public License for more details.
  218 
  219     You should have received a copy of the GNU General Public License
  220     along with this program; if not, write to the Free Software
  221     Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA  02110-1301 USA
  222 
  223 
  224 Also add information on how to contact you by electronic and paper mail.
  225 
  226 If the program is interactive, make it output a short notice like this
  227 when it starts in an interactive mode:
  228 
  229     Gnomovision version 69, Copyright (C) 19xx name of author
  230     Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
  231     This is free software, and you are welcome to redistribute it
  232     under certain conditions; type `show c' for details.
  233 
  234 The hypothetical commands `show w' and `show c' should show the
  235 appropriate parts of the General Public License.  Of course, the
  236 commands you use may be called something other than `show w' and `show
  237 c'; they could even be mouse-clicks or menu items--whatever suits your
  238 program.
  239 
  240 You should also get your employer (if you work as a programmer) or your
  241 school, if any, to sign a "copyright disclaimer" for the program, if
  242 necessary.  Here a sample; alter the names:
  243 
  244   Yoyodyne, Inc., hereby disclaims all copyright interest in the
  245   program `Gnomovision' (a program to direct compilers to make passes
  246   at assemblers) written by James Hacker.
  247 
  248   <signature of Ty Coon>, 1 April 1989
  249   Ty Coon, President of Vice
  250 
  251 That's all there is to it!