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1.1     ! root        1: @setfilename gpl.info
        !             2: 
        !             3: @unnumbered GNU GENERAL PUBLIC LICENSE
        !             4: @center Version 2, June 1991
        !             5: 
        !             6: @display
        !             7: Copyright @copyright{} 1989, 1991 Free Software Foundation, Inc.
        !             8: 675 Mass Ave, Cambridge, MA 02139, USA
        !             9: 
        !            10: Everyone is permitted to copy and distribute verbatim copies
        !            11: of this license document, but changing it is not allowed.
        !            12: @end display
        !            13: 
        !            14: @unnumberedsec Preamble
        !            15: 
        !            16:   The licenses for most software are designed to take away your
        !            17: freedom to share and change it.  By contrast, the GNU General Public
        !            18: License is intended to guarantee your freedom to share and change free
        !            19: software---to make sure the software is free for all its users.  This
        !            20: General Public License applies to most of the Free Software
        !            21: Foundation's software and to any other program whose authors commit to
        !            22: using it.  (Some other Free Software Foundation software is covered by
        !            23: the GNU Library General Public License instead.)  You can apply it to
        !            24: your programs, too.
        !            25: 
        !            26:   When we speak of free software, we are referring to freedom, not
        !            27: price.  Our General Public Licenses are designed to make sure that you
        !            28: have the freedom to distribute copies of free software (and charge for
        !            29: this service if you wish), that you receive source code or can get it
        !            30: if you want it, that you can change the software or use pieces of it
        !            31: in new free programs; and that you know you can do these things.
        !            32: 
        !            33:   To protect your rights, we need to make restrictions that forbid
        !            34: anyone to deny you these rights or to ask you to surrender the rights.
        !            35: These restrictions translate to certain responsibilities for you if you
        !            36: distribute copies of the software, or if you modify it.
        !            37: 
        !            38:   For example, if you distribute copies of such a program, whether
        !            39: gratis or for a fee, you must give the recipients all the rights that
        !            40: you have.  You must make sure that they, too, receive or can get the
        !            41: source code.  And you must show them these terms so they know their
        !            42: rights.
        !            43: 
        !            44:   We protect your rights with two steps: (1) copyright the software, and
        !            45: (2) offer you this license which gives you legal permission to copy,
        !            46: distribute and/or modify the software.
        !            47: 
        !            48:   Also, for each author's protection and ours, we want to make certain
        !            49: that everyone understands that there is no warranty for this free
        !            50: software.  If the software is modified by someone else and passed on, we
        !            51: want its recipients to know that what they have is not the original, so
        !            52: that any problems introduced by others will not reflect on the original
        !            53: authors' reputations.
        !            54: 
        !            55:   Finally, any free program is threatened constantly by software
        !            56: patents.  We wish to avoid the danger that redistributors of a free
        !            57: program will individually obtain patent licenses, in effect making the
        !            58: program proprietary.  To prevent this, we have made it clear that any
        !            59: patent must be licensed for everyone's free use or not licensed at all.
        !            60: 
        !            61:   The precise terms and conditions for copying, distribution and
        !            62: modification follow.
        !            63: 
        !            64: @iftex
        !            65: @unnumberedsec TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
        !            66: @end iftex
        !            67: @ifinfo
        !            68: @center TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
        !            69: @end ifinfo
        !            70: 
        !            71: @enumerate
        !            72: @item
        !            73: This License applies to any program or other work which contains
        !            74: a notice placed by the copyright holder saying it may be distributed
        !            75: under the terms of this General Public License.  The ``Program'', below,
        !            76: refers to any such program or work, and a ``work based on the Program''
        !            77: means either the Program or any derivative work under copyright law:
        !            78: that is to say, a work containing the Program or a portion of it,
        !            79: either verbatim or with modifications and/or translated into another
        !            80: language.  (Hereinafter, translation is included without limitation in
        !            81: the term ``modification''.)  Each licensee is addressed as ``you''.
        !            82: 
        !            83: Activities other than copying, distribution and modification are not
        !            84: covered by this License; they are outside its scope.  The act of
        !            85: running the Program is not restricted, and the output from the Program
        !            86: is covered only if its contents constitute a work based on the
        !            87: Program (independent of having been made by running the Program).
        !            88: Whether that is true depends on what the Program does.
        !            89: 
        !            90: @item
        !            91: You may copy and distribute verbatim copies of the Program's
        !            92: source code as you receive it, in any medium, provided that you
        !            93: conspicuously and appropriately publish on each copy an appropriate
        !            94: copyright notice and disclaimer of warranty; keep intact all the
        !            95: notices that refer to this License and to the absence of any warranty;
        !            96: and give any other recipients of the Program a copy of this License
        !            97: along with the Program.
        !            98: 
        !            99: You may charge a fee for the physical act of transferring a copy, and
        !           100: you may at your option offer warranty protection in exchange for a fee.
        !           101: 
        !           102: @item
        !           103: You may modify your copy or copies of the Program or any portion
        !           104: of it, thus forming a work based on the Program, and copy and
        !           105: distribute such modifications or work under the terms of Section 1
        !           106: above, provided that you also meet all of these conditions:
        !           107: 
        !           108: @enumerate a
        !           109: @item
        !           110: You must cause the modified files to carry prominent notices
        !           111: stating that you changed the files and the date of any change.
        !           112: 
        !           113: @item
        !           114: You must cause any work that you distribute or publish, that in
        !           115: whole or in part contains or is derived from the Program or any
        !           116: part thereof, to be licensed as a whole at no charge to all third
        !           117: parties under the terms of this License.
        !           118: 
        !           119: @item
        !           120: If the modified program normally reads commands interactively
        !           121: when run, you must cause it, when started running for such
        !           122: interactive use in the most ordinary way, to print or display an
        !           123: announcement including an appropriate copyright notice and a
        !           124: notice that there is no warranty (or else, saying that you provide
        !           125: a warranty) and that users may redistribute the program under
        !           126: these conditions, and telling the user how to view a copy of this
        !           127: License.  (Exception: if the Program itself is interactive but
        !           128: does not normally print such an announcement, your work based on
        !           129: the Program is not required to print an announcement.)
        !           130: @end enumerate
        !           131: 
        !           132: These requirements apply to the modified work as a whole.  If
        !           133: identifiable sections of that work are not derived from the Program,
        !           134: and can be reasonably considered independent and separate works in
        !           135: themselves, then this License, and its terms, do not apply to those
        !           136: sections when you distribute them as separate works.  But when you
        !           137: distribute the same sections as part of a whole which is a work based
        !           138: on the Program, the distribution of the whole must be on the terms of
        !           139: this License, whose permissions for other licensees extend to the
        !           140: entire whole, and thus to each and every part regardless of who wrote it.
        !           141: 
        !           142: Thus, it is not the intent of this section to claim rights or contest
        !           143: your rights to work written entirely by you; rather, the intent is to
        !           144: exercise the right to control the distribution of derivative or
        !           145: collective works based on the Program.
        !           146: 
        !           147: In addition, mere aggregation of another work not based on the Program
        !           148: with the Program (or with a work based on the Program) on a volume of
        !           149: a storage or distribution medium does not bring the other work under
        !           150: the scope of this License.
        !           151: 
        !           152: @item
        !           153: You may copy and distribute the Program (or a work based on it,
        !           154: under Section 2) in object code or executable form under the terms of
        !           155: Sections 1 and 2 above provided that you also do one of the following:
        !           156: 
        !           157: @enumerate a
        !           158: @item
        !           159: Accompany it with the complete corresponding machine-readable
        !           160: source code, which must be distributed under the terms of Sections
        !           161: 1 and 2 above on a medium customarily used for software interchange; or,
        !           162: 
        !           163: @item
        !           164: Accompany it with a written offer, valid for at least three
        !           165: years, to give any third party, for a charge no more than your
        !           166: cost of physically performing source distribution, a complete
        !           167: machine-readable copy of the corresponding source code, to be
        !           168: distributed under the terms of Sections 1 and 2 above on a medium
        !           169: customarily used for software interchange; or,
        !           170: 
        !           171: @item
        !           172: Accompany it with the information you received as to the offer
        !           173: to distribute corresponding source code.  (This alternative is
        !           174: allowed only for noncommercial distribution and only if you
        !           175: received the program in object code or executable form with such
        !           176: an offer, in accord with Subsection b above.)
        !           177: @end enumerate
        !           178: 
        !           179: The source code for a work means the preferred form of the work for
        !           180: making modifications to it.  For an executable work, complete source
        !           181: code means all the source code for all modules it contains, plus any
        !           182: associated interface definition files, plus the scripts used to
        !           183: control compilation and installation of the executable.  However, as a
        !           184: special exception, the source code distributed need not include
        !           185: anything that is normally distributed (in either source or binary
        !           186: form) with the major components (compiler, kernel, and so on) of the
        !           187: operating system on which the executable runs, unless that component
        !           188: itself accompanies the executable.
        !           189: 
        !           190: If distribution of executable or object code is made by offering
        !           191: access to copy from a designated place, then offering equivalent
        !           192: access to copy the source code from the same place counts as
        !           193: distribution of the source code, even though third parties are not
        !           194: compelled to copy the source along with the object code.
        !           195: 
        !           196: @item
        !           197: You may not copy, modify, sublicense, or distribute the Program
        !           198: except as expressly provided under this License.  Any attempt
        !           199: otherwise to copy, modify, sublicense or distribute the Program is
        !           200: void, and will automatically terminate your rights under this License.
        !           201: However, parties who have received copies, or rights, from you under
        !           202: this License will not have their licenses terminated so long as such
        !           203: parties remain in full compliance.
        !           204: 
        !           205: @item
        !           206: You are not required to accept this License, since you have not
        !           207: signed it.  However, nothing else grants you permission to modify or
        !           208: distribute the Program or its derivative works.  These actions are
        !           209: prohibited by law if you do not accept this License.  Therefore, by
        !           210: modifying or distributing the Program (or any work based on the
        !           211: Program), you indicate your acceptance of this License to do so, and
        !           212: all its terms and conditions for copying, distributing or modifying
        !           213: the Program or works based on it.
        !           214: 
        !           215: @item
        !           216: Each time you redistribute the Program (or any work based on the
        !           217: Program), the recipient automatically receives a license from the
        !           218: original licensor to copy, distribute or modify the Program subject to
        !           219: these terms and conditions.  You may not impose any further
        !           220: restrictions on the recipients' exercise of the rights granted herein.
        !           221: You are not responsible for enforcing compliance by third parties to
        !           222: this License.
        !           223: 
        !           224: @item
        !           225: If, as a consequence of a court judgment or allegation of patent
        !           226: infringement or for any other reason (not limited to patent issues),
        !           227: conditions are imposed on you (whether by court order, agreement or
        !           228: otherwise) that contradict the conditions of this License, they do not
        !           229: excuse you from the conditions of this License.  If you cannot
        !           230: distribute so as to satisfy simultaneously your obligations under this
        !           231: License and any other pertinent obligations, then as a consequence you
        !           232: may not distribute the Program at all.  For example, if a patent
        !           233: license would not permit royalty-free redistribution of the Program by
        !           234: all those who receive copies directly or indirectly through you, then
        !           235: the only way you could satisfy both it and this License would be to
        !           236: refrain entirely from distribution of the Program.
        !           237: 
        !           238: If any portion of this section is held invalid or unenforceable under
        !           239: any particular circumstance, the balance of the section is intended to
        !           240: apply and the section as a whole is intended to apply in other
        !           241: circumstances.
        !           242: 
        !           243: It is not the purpose of this section to induce you to infringe any
        !           244: patents or other property right claims or to contest validity of any
        !           245: such claims; this section has the sole purpose of protecting the
        !           246: integrity of the free software distribution system, which is
        !           247: implemented by public license practices.  Many people have made
        !           248: generous contributions to the wide range of software distributed
        !           249: through that system in reliance on consistent application of that
        !           250: system; it is up to the author/donor to decide if he or she is willing
        !           251: to distribute software through any other system and a licensee cannot
        !           252: impose that choice.
        !           253: 
        !           254: This section is intended to make thoroughly clear what is believed to
        !           255: be a consequence of the rest of this License.
        !           256: 
        !           257: @item
        !           258: If the distribution and/or use of the Program is restricted in
        !           259: certain countries either by patents or by copyrighted interfaces, the
        !           260: original copyright holder who places the Program under this License
        !           261: may add an explicit geographical distribution limitation excluding
        !           262: those countries, so that distribution is permitted only in or among
        !           263: countries not thus excluded.  In such case, this License incorporates
        !           264: the limitation as if written in the body of this License.
        !           265: 
        !           266: @item
        !           267: The Free Software Foundation may publish revised and/or new versions
        !           268: of the General Public License from time to time.  Such new versions will
        !           269: be similar in spirit to the present version, but may differ in detail to
        !           270: address new problems or concerns.
        !           271: 
        !           272: Each version is given a distinguishing version number.  If the Program
        !           273: specifies a version number of this License which applies to it and ``any
        !           274: later version'', you have the option of following the terms and conditions
        !           275: either of that version or of any later version published by the Free
        !           276: Software Foundation.  If the Program does not specify a version number of
        !           277: this License, you may choose any version ever published by the Free Software
        !           278: Foundation.
        !           279: 
        !           280: @item
        !           281: If you wish to incorporate parts of the Program into other free
        !           282: programs whose distribution conditions are different, write to the author
        !           283: to ask for permission.  For software which is copyrighted by the Free
        !           284: Software Foundation, write to the Free Software Foundation; we sometimes
        !           285: make exceptions for this.  Our decision will be guided by the two goals
        !           286: of preserving the free status of all derivatives of our free software and
        !           287: of promoting the sharing and reuse of software generally.
        !           288: 
        !           289: @iftex
        !           290: @heading NO WARRANTY
        !           291: @end iftex
        !           292: @ifinfo
        !           293: @center NO WARRANTY
        !           294: @end ifinfo
        !           295: 
        !           296: @item
        !           297: BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
        !           298: FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
        !           299: OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
        !           300: PROVIDE THE PROGRAM ``AS IS'' WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
        !           301: OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
        !           302: MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
        !           303: TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
        !           304: PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
        !           305: REPAIR OR CORRECTION.
        !           306: 
        !           307: @item
        !           308: IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
        !           309: WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
        !           310: REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
        !           311: INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
        !           312: OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
        !           313: TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
        !           314: YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
        !           315: PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
        !           316: POSSIBILITY OF SUCH DAMAGES.
        !           317: @end enumerate
        !           318: 
        !           319: @iftex
        !           320: @heading END OF TERMS AND CONDITIONS
        !           321: @end iftex
        !           322: @ifinfo
        !           323: @center END OF TERMS AND CONDITIONS
        !           324: @end ifinfo
        !           325: 
        !           326: @page
        !           327: @unnumberedsec How to Apply These Terms to Your New Programs
        !           328: 
        !           329:   If you develop a new program, and you want it to be of the greatest
        !           330: possible use to the public, the best way to achieve this is to make it
        !           331: free software which everyone can redistribute and change under these terms.
        !           332: 
        !           333:   To do so, attach the following notices to the program.  It is safest
        !           334: to attach them to the start of each source file to most effectively
        !           335: convey the exclusion of warranty; and each file should have at least
        !           336: the ``copyright'' line and a pointer to where the full notice is found.
        !           337: 
        !           338: @smallexample
        !           339: @var{one line to give the program's name and an idea of what it does.}
        !           340: Copyright (C) 19@var{yy}  @var{name of author}
        !           341: 
        !           342: This program is free software; you can redistribute it and/or
        !           343: modify it under the terms of the GNU General Public License
        !           344: as published by the Free Software Foundation; either version 2
        !           345: of the License, or (at your option) any later version.
        !           346: 
        !           347: This program is distributed in the hope that it will be useful,
        !           348: but WITHOUT ANY WARRANTY; without even the implied warranty of
        !           349: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        !           350: GNU General Public License for more details.
        !           351: 
        !           352: You should have received a copy of the GNU General Public License
        !           353: along with this program; if not, write to the Free Software
        !           354: Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
        !           355: @end smallexample
        !           356: 
        !           357: Also add information on how to contact you by electronic and paper mail.
        !           358: 
        !           359: If the program is interactive, make it output a short notice like this
        !           360: when it starts in an interactive mode:
        !           361: 
        !           362: @smallexample
        !           363: Gnomovision version 69, Copyright (C) 19@var{yy} @var{name of author}
        !           364: Gnomovision comes with ABSOLUTELY NO WARRANTY; for details
        !           365: type `show w'.  This is free software, and you are welcome
        !           366: to redistribute it under certain conditions; type `show c' 
        !           367: for details.
        !           368: @end smallexample
        !           369: 
        !           370: The hypothetical commands @samp{show w} and @samp{show c} should show
        !           371: the appropriate parts of the General Public License.  Of course, the
        !           372: commands you use may be called something other than @samp{show w} and
        !           373: @samp{show c}; they could even be mouse-clicks or menu items---whatever
        !           374: suits your program.
        !           375: 
        !           376: You should also get your employer (if you work as a programmer) or your
        !           377: school, if any, to sign a ``copyright disclaimer'' for the program, if
        !           378: necessary.  Here is a sample; alter the names:
        !           379: 
        !           380: @example
        !           381: Yoyodyne, Inc., hereby disclaims all copyright
        !           382: interest in the program `Gnomovision'
        !           383: (which makes passes at compilers) written 
        !           384: by James Hacker.
        !           385: 
        !           386: @var{signature of Ty Coon}, 1 April 1989
        !           387: Ty Coon, President of Vice
        !           388: @end example
        !           389: 
        !           390: This General Public License does not permit incorporating your program into
        !           391: proprietary programs.  If your program is a subroutine library, you may
        !           392: consider it more useful to permit linking proprietary applications with the
        !           393: library.  If this is what you want to do, use the GNU Library General
        !           394: Public License instead of this License.

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