
      The GNU General Public License (GPL)
      Version 2, June 1991

      Copyright (C) 1989, 1991 Free Software Foundation, Inc.
      59 Temple Place, Suite 330, Boston, MA 02111-1307 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

      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