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.

 

                      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) <year>  <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) year 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 Lesser General

 Public License instead of this License.