The General Public License (GPL)

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