        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 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.




