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

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.