license.txt

GNU GENERAL PUBLIC LICENSE


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