
                         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 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.

      TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION

   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 a brief idea of what it does.
     Copyright (C) 19yy  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) 19yy  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 Library General Public License instead of this License.
