GNU GENERAL PUBLIC LICENSE

      
     
		    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 prog
   
     ram 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 th
   
     e 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 sectio
   
     n 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" WITHOU
   
     T 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; wit
   
     hout 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.