
                          GNU GENERAL PUBLIC LICENSE
                                       
                             VERSION 2, JUNE 1991
                                       
     Copyright (C) 1989, 1991 Free Software Foundation, Inc. 675 Mass
     Ave, Cambridge, MA 02139, USA
     
     Everyone is permitted to copy and distribute verbatim copies of this
     license document, but changing it is not allowed.
     
   
   
Preamble

   The licenses for most software are designed to take away your freedom
   to share and change it. By contrast, the GNU General Public License is
   intended to guarantee your freedom to share and change free
   software--to make sure the software is free for all its users. This
   General Public License applies to most of the Free Software
   Foundation's software and to any other program whose authors commit to
   using it. (Some other Free Software Foundation software is covered by
   the GNU Library General Public License instead.) You can apply it to
   your programs, too.
   
   When we speak of free software, we are referring to freedom, not
   price. Our General Public Licenses are designed to make sure that you
   have the freedom to distribute copies of free software (and charge for
   this service if you wish), that you receive source code or can get it
   if you want it, that you can change the software or use pieces of it
   in new free programs; and that you know you can do these things.
   
   To protect your rights, we need to make restrictions that forbid
   anyone to deny you these rights or to ask you to surrender the rights.
   These restrictions translate to certain responsibilities for you if
   you distribute copies of the software, or if you modify it.
   
   For example, if you distribute copies of such a program, whether
   gratis or for a fee, you must give the recipients all the rights that
   you have. You must make sure that they, too, receive or can get the
   source code. And you must show them these terms so they know their
   rights.
   
   We protect your rights with two steps: (1) copyright the software, and
   (2) offer you this license which gives you legal permission to copy,
   distribute and/or modify the software.
   
   Also, for each author's protection and ours, we want to make certain
   that everyone understands that there is no warranty for this free
   software. If the software is modified by someone else and passed on,
   we want its recipients to know that what they have is not the
   original, so that any problems introduced by others will not reflect
   on the original authors' reputations.
   
   Finally, any free program is threatened constantly by software
   patents. We wish to avoid the danger that redistributors of a free
   program will individually obtain patent licenses, in effect making the
   program proprietary. To prevent this, we have made it clear that any
   patent must be licensed for everyone's free use or not licensed at
   all.
   
   The precise terms and conditions for copying, distribution and
   modification follow. 
   
GNU GENERAL PUBLIC LICENSE

TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION

   
   0.
          This License applies to any program or other work which
          contains a notice placed by the copyright holder saying it may
          be distributed under the terms of this General Public License.
          The "Program", below, refers to any such program or work, and a
          "work based on the Program" means either the Program or any
          derivative work under copyright law: that is to say, a work
          containing the Program or a portion of it, either verbatim or
          with modifications and/or translated into another language.
          (Hereinafter, translation is included without limitation in the
          term "modification".) Each licensee is addressed as "you".
          
          Activities other than copying, distribution and modification
          are not covered by this License; they are outside its scope.
          The act of running the Program is not restricted, and the
          output from the Program is covered only if its contents
          constitute a work based on the Program (independent of having
          been made by running the Program). Whether that is true depends
          on what the Program does. 
          
          
   1.
          You may copy and distribute verbatim copies of the Program's
          source code as you receive it, in any medium, provided that you
          conspicuously and appropriately publish on each copy an
          appropriate copyright notice and disclaimer of warranty; keep
          intact all the notices that refer to this License and to the
          absence of any warranty; and give any other recipients of the
          Program a copy of this License along with the Program.
          
          You may charge a fee for the physical act of transferring a
          copy, and you may at your option offer warranty protection in
          exchange for a fee. 
          
          
   2.
          You may modify your copy or copies of the Program or any
          portion of it, thus forming a work based on the Program, and
          copy and distribute such modifications or work under the terms
          of Section 1 above, provided that you also meet all of these
          conditions:
        
               
               
        a)
               You must cause the modified files to carry prominent
               notices stating that you changed the files and the date of
               any change. 
               
               
        b)
               You must cause any work that you distribute or publish,
               that in whole or in part contains or is derived from the
               Program or any part thereof, to be licensed as a whole at
               no charge to all third parties under the terms of this
               License. 
               
               
        c)
               If the modified program normally reads commands
               interactively when run, you must cause it, when started
               running for such interactive use in the most ordinary way,
               to print or display an announcement including an
               appropriate copyright notice and a notice that there is no
               warranty (or else, saying that you provide a warranty) and
               that users may redistribute the program under these
               conditions, and telling the user how to view a copy of
               this License. (Exception: if the Program itself is
               interactive but does not normally print such an
               announcement, your work based on the Program is not
               required to print an announcement.)
   
          
          These requirements apply to the modified work as a whole. If
          identifiable sections of that work are not derived from the
          Program, and can be reasonably considered independent and
          separate works in themselves, then this License, and its terms,
          do not apply to those sections when you distribute them as
          separate works. But when you distribute the same sections as
          part of a whole which is a work based on the Program, the
          distribution of the whole must be on the terms of this License,
          whose permissions for other licensees extend to the entire
          whole, and thus to each and every part regardless of who wrote
          it.
          
          Thus, it is not the intent of this section to claim rights or
          contest your rights to work written entirely by you; rather,
          the intent is to exercise the right to control the distribution
          of derivative or collective works based on the Program.
          
          In addition, mere aggregation of another work not based on the
          Program with the Program (or with a work based on the Program)
          on a volume of a storage or distribution medium does not bring
          the other work under the scope of this License. 
          
          
   3.
          You may copy and distribute the Program (or a work based on it,
          under Section 2) in object code or executable form under the
          terms of Sections 1 and 2 above provided that you also do one
          of the following:
        
               
               
        a)
               Accompany it with the complete corresponding
               machine-readable source code, which must be distributed
               under the terms of Sections 1 and 2 above on a medium
               customarily used for software interchange; or, 
               
               
        b)
               Accompany it with a written offer, valid for at least
               three years, to give any third party, for a charge no more
               than your cost of physically performing source
               distribution, a complete machine-readable copy of the
               corresponding source code, to be distributed under the
               terms of Sections 1 and 2 above on a medium customarily
               used for software interchange; or, 
               
               
        c)
               Accompany it with the information you received as to the
               offer to distribute corresponding source code. (This
               alternative is allowed only for noncommercial distribution
               and only if you received the program in object code or
               executable form with such an offer, in accord with
               Subsection b above.)
   
          
          The source code for a work means the preferred form of the work
          for making modifications to it. For an executable work,
          complete source code means all the source code for all modules
          it contains, plus any associated interface definition files,
          plus the scripts used to control compilation and installation
          of the executable. However, as a special exception, the source
          code distributed need not include anything that is normally
          distributed (in either source or binary form) with the major
          components (compiler, kernel, and so on) of the operating
          system on which the executable runs, unless that component
          itself accompanies the executable.
          
          If distribution of executable or object code is made by
          offering access to copy from a designated place, then offering
          equivalent access to copy the source code from the same place
          counts as distribution of the source code, even though third
          parties are not compelled to copy the source along with the
          object code. 
          
          
   4.
          You may not copy, modify, sublicense, or distribute the Program
          except as expressly provided under this License. Any attempt
          otherwise to copy, modify, sublicense or distribute the Program
          is void, and will automatically terminate your rights under
          this License. However, parties who have received copies, or
          rights, from you under this License will not have their
          licenses terminated so long as such parties remain in full
          compliance. 
          
          
   5.
          You are not required to accept this License, since you have not
          signed it. However, nothing else grants you permission to
          modify or distribute the Program or its derivative works. These
          actions are prohibited by law if you do not accept this
          License. Therefore, by modifying or distributing the Program
          (or any work based on the Program), you indicate your
          acceptance of this License to do so, and all its terms and
          conditions for copying, distributing or modifying the Program
          or works based on it. 
          
          
   6.
          Each time you redistribute the Program (or any work based on
          the Program), the recipient automatically receives a license
          from the original licensor to copy, distribute or modify the
          Program subject to these terms and conditions. You may not
          impose any further restrictions on the recipients' exercise of
          the rights granted herein. You are not responsible for
          enforcing compliance by third parties to this License. 
          
          
   7.
          If, as a consequence of a court judgment or allegation of
          patent infringement or for any other reason (not limited to
          patent issues), conditions are imposed on you (whether by court
          order, agreement or otherwise) that contradict the conditions
          of this License, they do not excuse you from the conditions of
          this License. If you cannot distribute so as to satisfy
          simultaneously your obligations under this License and any
          other pertinent obligations, then as a consequence you may not
          distribute the Program at all. For example, if a patent license
          would not permit royalty-free redistribution of the Program by
          all those who receive copies directly or indirectly through
          you, then the only way you could satisfy both it and this
          License would be to refrain entirely from distribution of the
          Program.
          
          If any portion of this section is held invalid or unenforceable
          under any particular circumstance, the balance of the section
          is intended to apply and the section as a whole is intended to
          apply in other circumstances.
          
          It is not the purpose of this section to induce you to infringe
          any patents or other property right claims or to contest
          validity of any such claims; this section has the sole purpose
          of protecting the integrity of the free software distribution
          system, which is implemented by public license practices. Many
          people have made generous contributions to the wide range of
          software distributed through that system in reliance on
          consistent application of that system; it is up to the
          author/donor to decide if he or she is willing to distribute
          software through any other system and a licensee cannot impose
          that choice.
          
          This section is intended to make thoroughly clear what is
          believed to be a consequence of the rest of this License. 
          
          
   8.
          If the distribution and/or use of the Program is restricted in
          certain countries either by patents or by copyrighted
          interfaces, the original copyright holder who places the
          Program under this License may add an explicit geographical
          distribution limitation excluding those countries, so that
          distribution is permitted only in or among countries not thus
          excluded. In such case, this License incorporates the
          limitation as if written in the body of this License. 
          
          
   9.
          The Free Software Foundation may publish revised and/or new
          versions of the General Public License from time to time. Such
          new versions will be similar in spirit to the present version,
          but may differ in detail to address new problems or concerns.
          
          Each version is given a distinguishing version number. If the
          Program specifies a version number of this License which
          applies to it and "any later version", you have the option of
          following the terms and conditions either of that version or of
          any later version published by the Free Software Foundation. If
          the Program does not specify a version number of this License,
          you may choose any version ever published by the Free Software
          Foundation. 
          
          
   10.
          If you wish to incorporate parts of the Program into other free
          programs whose distribution conditions are different, write to
          the author to ask for permission. For software which is
          copyrighted by the Free Software Foundation, write to the Free
          Software Foundation; we sometimes make exceptions for this. Our
          decision will be guided by the two goals of preserving the free
          status of all derivatives of our free software and of promoting
          the sharing and reuse of software generally.
          
          
          
  NO WARRANTY
   
   11.
          BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO
          WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE
          LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
          HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS"
          WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED,
          INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
          MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE
          ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS
          WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE
          COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 
          
          
   12.
          IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN
          WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY
          MODIFY AND/OR REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE
          LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL,
          INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR
          INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS
          OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED
          BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE
          WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY
          HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
          
   
   
  END OF TERMS AND CONDITIONS
  
   
     _________________________________________________________________
   
   
   
Appendix: How to Apply These Terms to Your New Programs

   If you develop a new program, and you want it to be of the greatest
   possible use to the public, the best way to achieve this is to make it
   free software which everyone can redistribute and change under these
   terms.
   
   To do so, attach the following notices to the program. It is safest to
   attach them to the start of each source file to most effectively
   convey the exclusion of warranty; and each file should have at least
   the "copyright" line and a pointer to where the full notice is found.
   

    <one line to give the program's name and a brief idea of what it does.>
    Copyright (C) 19yy  <name of author>

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

   Also add information on how to contact you by electronic and paper
   mail.
   
   If the program is interactive, make it output a short notice like this
   when it starts in an interactive mode:
   

    Gnomovision version 69, Copyright (C) 19yy name of author
    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
    This is free software, and you are welcome to redistribute it
    under certain conditions; type `show c' for details.

   The hypothetical commands `show w' and `show c' should show the
   appropriate parts of the General Public License. Of course, the
   commands you use may be called something other than `show w' and `show
   c'; they could even be mouse-clicks or menu items--whatever suits your
   program.
   
   You should also get your employer (if you work as a programmer) or
   your school, if any, to sign a "copyright disclaimer" for the program,
   if necessary. Here is a sample; alter the names:
   
     Yoyodyne, Inc., hereby disclaims all copyright interest in the
     program `Gnomovision' (which makes passes at compilers) written by
     James Hacker.
     
     <signature of Ty Coon>, 1 April 1989
     Ty Coon, President of Vice
     
   This General Public License does not permit incorporating your program
   into proprietary programs. If your program is a subroutine library,
   you may consider it more useful to permit linking proprietary
   applications with the library. If this is what you want to do, use the
   GNU Library General Public License instead of this License.
