COPYING.txt

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.