1:                     GNU GENERAL PUBLIC LICENSE
    2:                        Version 2, June 1991
    3: 
    4:  Copyright (C) 1989, 1991 Free Software Foundation, Inc.
    5:      59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
    6:  Everyone is permitted to copy and distribute verbatim copies
    7:  of this license document, but changing it is not allowed.
    8: 
    9:                             Preamble
   10: 
   11:   The licenses for most software are designed to take away your
   12: freedom to share and change it.  By contrast, the GNU General Public
   13: License is intended to guarantee your freedom to share and change free
   14: software--to make sure the software is free for all its users.  This
   15: General Public License applies to most of the Free Software
   16: Foundation's software and to any other program whose authors commit to
   17: using it.  (Some other Free Software Foundation software is covered by
   18: the GNU Library General Public License instead.)  You can apply it to
   19: your programs, too.
   20: 
   21:   When we speak of free software, we are referring to freedom, not
   22: price.  Our General Public Licenses are designed to make sure that you
   23: have the freedom to distribute copies of free software (and charge for
   24: this service if you wish), that you receive source code or can get it
   25: if you want it, that you can change the software or use pieces of it
   26: in new free programs; and that you know you can do these things.
   27: 
   28:   To protect your rights, we need to make restrictions that forbid
   29: anyone to deny you these rights or to ask you to surrender the rights.
   30: These restrictions translate to certain responsibilities for you if you
   31: distribute copies of the software, or if you modify it.
   32: 
   33:   For example, if you distribute copies of such a program, whether
   34: gratis or for a fee, you must give the recipients all the rights that
   35: you have.  You must make sure that they, too, receive or can get the
   36: source code.  And you must show them these terms so they know their
   37: rights.
   38: 
   39:   We protect your rights with two steps: (1) copyright the software, and
   40: (2) offer you this license which gives you legal permission to copy,
   41: distribute and/or modify the software.
   42: 
   43:   Also, for each author's protection and ours, we want to make certain
   44: that everyone understands that there is no warranty for this free
   45: software.  If the software is modified by someone else and passed on, we
   46: want its recipients to know that what they have is not the original, so
   47: that any problems introduced by others will not reflect on the original
   48: authors' reputations.
   49: 
   50:   Finally, any free program is threatened constantly by software
   51: patents.  We wish to avoid the danger that redistributors of a free
   52: program will individually obtain patent licenses, in effect making the
   53: program proprietary.  To prevent this, we have made it clear that any
   54: patent must be licensed for everyone's free use or not licensed at all.
   55: 
   56:   The precise terms and conditions for copying, distribution and
   57: modification follow.
   58: ^L
   59:                     GNU GENERAL PUBLIC LICENSE
   60:    TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
   61: 
   62:   0. This License applies to any program or other work which contains
   63: a notice placed by the copyright holder saying it may be distributed
   64: under the terms of this General Public License.  The "Program", below,
   65: refers to any such program or work, and a "work based on the Program"
   66: means either the Program or any derivative work under copyright law:
   67: that is to say, a work containing the Program or a portion of it,
   68: either verbatim or with modifications and/or translated into another
   69: language.  (Hereinafter, translation is included without limitation in
   70: the term "modification".)  Each licensee is addressed as "you".
   71: 
   72: Activities other than copying, distribution and modification are not
   73: covered by this License; they are outside its scope.  The act of
   74: running the Program is not restricted, and the output from the Program
   75: is covered only if its contents constitute a work based on the
   76: Program (independent of having been made by running the Program).
   77: Whether that is true depends on what the Program does.
   78: 
   79:   1. You may copy and distribute verbatim copies of the Program's
   80: source code as you receive it, in any medium, provided that you
   81: conspicuously and appropriately publish on each copy an appropriate
   82: copyright notice and disclaimer of warranty; keep intact all the
   83: notices that refer to this License and to the absence of any warranty;
   84: and give any other recipients of the Program a copy of this License
   85: along with the Program.
   86: 
   87: You may charge a fee for the physical act of transferring a copy, and
   88: you may at your option offer warranty protection in exchange for a fee.
   89: 
   90:   2. You may modify your copy or copies of the Program or any portion
   91: of it, thus forming a work based on the Program, and copy and
   92: distribute such modifications or work under the terms of Section 1
   93: above, provided that you also meet all of these conditions:
   94: 
   95:     a) You must cause the modified files to carry prominent notices
   96:     stating that you changed the files and the date of any change.
   97: 
   98:     b) You must cause any work that you distribute or publish, that in
   99:     whole or in part contains or is derived from the Program or any
  100:     part thereof, to be licensed as a whole at no charge to all third
  101:     parties under the terms of this License.
  102: 
  103:     c) If the modified program normally reads commands interactively
  104:     when run, you must cause it, when started running for such
  105:     interactive use in the most ordinary way, to print or display an
  106:     announcement including an appropriate copyright notice and a
  107:     notice that there is no warranty (or else, saying that you provide
  108:     a warranty) and that users may redistribute the program under
  109:     these conditions, and telling the user how to view a copy of this
  110:     License.  (Exception: if the Program itself is interactive but
  111:     does not normally print such an announcement, your work based on
  112:     the Program is not required to print an announcement.)
  113: ^L
  114: These requirements apply to the modified work as a whole.  If
  115: identifiable sections of that work are not derived from the Program,
  116: and can be reasonably considered independent and separate works in
  117: themselves, then this License, and its terms, do not apply to those
  118: sections when you distribute them as separate works.  But when you
  119: distribute the same sections as part of a whole which is a work based
  120: on the Program, the distribution of the whole must be on the terms of
  121: this License, whose permissions for other licensees extend to the
  122: entire whole, and thus to each and every part regardless of who wrote it.
  123: 
  124: Thus, it is not the intent of this section to claim rights or contest
  125: your rights to work written entirely by you; rather, the intent is to
  126: exercise the right to control the distribution of derivative or
  127: collective works based on the Program.
  128: 
  129: In addition, mere aggregation of another work not based on the Program
  130: with the Program (or with a work based on the Program) on a volume of
  131: a storage or distribution medium does not bring the other work under
  132: the scope of this License.
  133: 
  134:   3. You may copy and distribute the Program (or a work based on it,
  135: under Section 2) in object code or executable form under the terms of
  136: Sections 1 and 2 above provided that you also do one of the following:
  137: 
  138:     a) Accompany it with the complete corresponding machine-readable
  139:     source code, which must be distributed under the terms of Sections
  140:     1 and 2 above on a medium customarily used for software interchange; or,
  141: 
  142:     b) Accompany it with a written offer, valid for at least three
  143:     years, to give any third party, for a charge no more than your
  144:     cost of physically performing source distribution, a complete
  145:     machine-readable copy of the corresponding source code, to be
  146:     distributed under the terms of Sections 1 and 2 above on a medium
  147:     customarily used for software interchange; or,
  148: 
  149:     c) Accompany it with the information you received as to the offer
  150:     to distribute corresponding source code.  (This alternative is
  151:     allowed only for noncommercial distribution and only if you
  152:     received the program in object code or executable form with such
  153:     an offer, in accord with Subsection b above.)
  154: 
  155: The source code for a work means the preferred form of the work for
  156: making modifications to it.  For an executable work, complete source
  157: code means all the source code for all modules it contains, plus any
  158: associated interface definition files, plus the scripts used to
  159: control compilation and installation of the executable.  However, as a
  160: special exception, the source code distributed need not include
  161: anything that is normally distributed (in either source or binary
  162: form) with the major components (compiler, kernel, and so on) of the
  163: operating system on which the executable runs, unless that component
  164: itself accompanies the executable.
  165: 
  166: If distribution of executable or object code is made by offering
  167: access to copy from a designated place, then offering equivalent
  168: access to copy the source code from the same place counts as
  169: distribution of the source code, even though third parties are not
  170: compelled to copy the source along with the object code.
  171: ^L
  172:   4. You may not copy, modify, sublicense, or distribute the Program
  173: except as expressly provided under this License.  Any attempt
  174: otherwise to copy, modify, sublicense or distribute the Program is
  175: void, and will automatically terminate your rights under this License.
  176: However, parties who have received copies, or rights, from you under
  177: this License will not have their licenses terminated so long as such
  178: parties remain in full compliance.
  179: 
  180:   5. You are not required to accept this License, since you have not
  181: signed it.  However, nothing else grants you permission to modify or
  182: distribute the Program or its derivative works.  These actions are
  183: prohibited by law if you do not accept this License.  Therefore, by
  184: modifying or distributing the Program (or any work based on the
  185: Program), you indicate your acceptance of this License to do so, and
  186: all its terms and conditions for copying, distributing or modifying
  187: the Program or works based on it.
  188: 
  189:   6. Each time you redistribute the Program (or any work based on the
  190: Program), the recipient automatically receives a license from the
  191: original licensor to copy, distribute or modify the Program subject to
  192: these terms and conditions.  You may not impose any further
  193: restrictions on the recipients' exercise of the rights granted herein.
  194: You are not responsible for enforcing compliance by third parties to
  195: this License.
  196: 
  197:   7. If, as a consequence of a court judgment or allegation of patent
  198: infringement or for any other reason (not limited to patent issues),
  199: conditions are imposed on you (whether by court order, agreement or
  200: otherwise) that contradict the conditions of this License, they do not
  201: excuse you from the conditions of this License.  If you cannot
  202: distribute so as to satisfy simultaneously your obligations under this
  203: License and any other pertinent obligations, then as a consequence you
  204: may not distribute the Program at all.  For example, if a patent
  205: license would not permit royalty-free redistribution of the Program by
  206: all those who receive copies directly or indirectly through you, then
  207: the only way you could satisfy both it and this License would be to
  208: refrain entirely from distribution of the Program.
  209: 
  210: If any portion of this section is held invalid or unenforceable under
  211: any particular circumstance, the balance of the section is intended to
  212: apply and the section as a whole is intended to apply in other
  213: circumstances.
  214: 
  215: It is not the purpose of this section to induce you to infringe any
  216: patents or other property right claims or to contest validity of any
  217: such claims; this section has the sole purpose of protecting the
  218: integrity of the free software distribution system, which is
  219: implemented by public license practices.  Many people have made
  220: generous contributions to the wide range of software distributed
  221: through that system in reliance on consistent application of that
  222: system; it is up to the author/donor to decide if he or she is willing
  223: to distribute software through any other system and a licensee cannot
  224: impose that choice.
  225: 
  226: This section is intended to make thoroughly clear what is believed to
  227: be a consequence of the rest of this License.
  228: ^L
  229:   8. If the distribution and/or use of the Program is restricted in
  230: certain countries either by patents or by copyrighted interfaces, the
  231: original copyright holder who places the Program under this License
  232: may add an explicit geographical distribution limitation excluding
  233: those countries, so that distribution is permitted only in or among
  234: countries not thus excluded.  In such case, this License incorporates
  235: the limitation as if written in the body of this License.
  236: 
  237:   9. The Free Software Foundation may publish revised and/or new versions
  238: of the General Public License from time to time.  Such new versions will
  239: be similar in spirit to the present version, but may differ in detail to
  240: address new problems or concerns.
  241: 
  242: Each version is given a distinguishing version number.  If the Program
  243: specifies a version number of this License which applies to it and "any
  244: later version", you have the option of following the terms and conditions
  245: either of that version or of any later version published by the Free
  246: Software Foundation.  If the Program does not specify a version number of
  247: this License, you may choose any version ever published by the Free Software
  248: Foundation.
  249: 
  250:   10. If you wish to incorporate parts of the Program into other free
  251: programs whose distribution conditions are different, write to the author
  252: to ask for permission.  For software which is copyrighted by the Free
  253: Software Foundation, write to the Free Software Foundation; we sometimes
  254: make exceptions for this.  Our decision will be guided by the two goals
  255: of preserving the free status of all derivatives of our free software and
  256: of promoting the sharing and reuse of software generally.
  257: 
  258:                             NO WARRANTY
  259: 
  260:   11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
  261: FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
  262: OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
  263: PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
  264: OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  265: MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
  266: TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
  267: PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
  268: REPAIR OR CORRECTION.
  269: 
  270:   12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
  271: WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
  272: REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
  273: INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
  274: OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
  275: TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
  276: YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
  277: PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
  278: POSSIBILITY OF SUCH DAMAGES.
  279: 
  280:                      END OF TERMS AND CONDITIONS
  281: ^L
  282:             How to Apply These Terms to Your New Programs
  283: 
  284:   If you develop a new program, and you want it to be of the greatest
  285: possible use to the public, the best way to achieve this is to make it
  286: free software which everyone can redistribute and change under these terms.
  287: 
  288:   To do so, attach the following notices to the program.  It is safest
  289: to attach them to the start of each source file to most effectively
  290: convey the exclusion of warranty; and each file should have at least
  291: the "copyright" line and a pointer to where the full notice is found.
  292: 
  293:     <one line to give the program's name and a brief idea of what it does.>
  294:     Copyright (C) 19yy  <name of author>
  295: 
  296:     This program is free software; you can redistribute it and/or modify
  297:     it under the terms of the GNU General Public License as published by
  298:     the Free Software Foundation; either version 2 of the License, or
  299:     (at your option) any later version.
  300: 
  301:     This program is distributed in the hope that it will be useful,
  302:     but WITHOUT ANY WARRANTY; without even the implied warranty of
  303:     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  304:     GNU General Public License for more details.
  305: 
  306:     You should have received a copy of the GNU General Public License
  307:     along with this program; if not, write to the Free Software
  308:     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  309: 
  310: 
  311: Also add information on how to contact you by electronic and paper mail.
  312: 
  313: If the program is interactive, make it output a short notice like this
  314: when it starts in an interactive mode:
  315: 
  316:     Gnomovision version 69, Copyright (C) 19yy name of author
  317:     Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
  318:     This is free software, and you are welcome to redistribute it
  319:     under certain conditions; type `show c' for details.
  320: 
  321: The hypothetical commands `show w' and `show c' should show the appropriate
  322: parts of the General Public License.  Of course, the commands you use may
  323: be called something other than `show w' and `show c'; they could even be
  324: mouse-clicks or menu items--whatever suits your program.
  325: 
  326: You should also get your employer (if you work as a programmer) or your
  327: school, if any, to sign a "copyright disclaimer" for the program, if
  328: necessary.  Here is a sample; alter the names:
  329: 
  330:   Yoyodyne, Inc., hereby disclaims all copyright interest in the program
  331:   `Gnomovision' (which makes passes at compilers) written by James Hacker.
  332: 
  333:   <signature of Ty Coon>, 1 April 1989
  334:   Ty Coon, President of Vice
  335: 
  336: This General Public License does not permit incorporating your program into
  337: proprietary programs.  If your program is a subroutine library, you may
  338: consider it more useful to permit linking proprietary applications with the
  339: library.  If this is what you want to do, use the GNU Library General
  340: Public License instead of this License.