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 Pu-
blic 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 re-
sponsibilities 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 under-
stands 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 au-
thors' 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 licen-
ses, 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 modifi-
cations 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 Li-
cense; 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 recei-
ve 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 no-
tices 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 op-
tion 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 nor-
mally 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 dis-
tribution 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 distri-
bution, a complete machine-readable copy of the corresponding source code, to be distri-
buted 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 cor-
responding 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 of-
fer, 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 mo-
dules it contains, plus any associated interface definition files, plus the scripts used 
to control compilation and installation of the executable. However, as a special excepti-
on, 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 accom-
panies 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 com-
pelled 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 distri-
bute the Program is void, and will automatically terminate your rights under this Licen-
se. 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 complian-
ce.

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 reci-
pient 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 re-
sponsible 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 examp-
le, 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 so-
le 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 wil-
ling 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 eit-
her 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 pu-
blished 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 Foundati-
on.

10. If you wish to incorporate parts of the Program into other free programs whose dis-
tribution conditions are different, write to the author to ask for permission. For soft-
ware which is copyrighted by the Free Software Foundation, write to the Free Software Fo-
undation; 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 promo-
ting 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 WARRAN-
TIES 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 COPY-
RIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR REDISTRIBUTE THE PROGRAM AS PER-
MITTED 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
