

GNU GENERAL PUBLIC LICENSE

Version 2, June 1991 

Copyright (C) 1989, 1991 Free Software Foundation, Inc.  
59 Temple Place - Suite 330, Boston, MA  02111-1307, 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. 

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 an idea of what it does.
Copyright (C) yyyy  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., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
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) yyyy 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. 
