licence

GNU GENERAL PUBLIC LICENSE

Version 2, June 1991

Copyright (C) 1989, 1991 Free Software Foundation, Inc.  
51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 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 Lesser 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., 
51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 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) year 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 Lesser 
General Public License instead of this License.