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<sect1 role="legal">
 <title>GNU General Public License</title>

 <para>
  Version 2, June 1991
 </para>

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

 <para>
  Everyone is permitted to copy and distribute verbatim copies of this
  license document, but changing it is not allowed.
 </para>

 <sect2>
  <title>Preamble</title>
  <para>
   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&rsquo;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.
  </para>
  <para>
   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.
  </para>
  <para>
   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.
  </para>
  <para>
   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.
  </para>
  <para>
   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&sol;or modify the software.
  </para>
  <para>
   Also, for each author&rsquo;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&rsquo; reputations.
  </para>
  <para>
   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&rsquo;s free use or not licensed at all.
  </para>
  <para>
   The precise terms and conditions for copying, distribution and
   modification follow.
  </para>
 </sect2>

<?dbfo-need height="20em"?>

 <sect2>
  <title>GNU GENERAL PUBLIC LICENSE TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION</title>
  <formalpara>
   <title>0.</title>
   <para>
    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 <quote>Program</quote>,
    below, refers to any such program or work, and a <quote>work based on
    the Program</quote> 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&sol;or
    translated into another language. (Hereinafter, translation is included
    without limitation in the term <quote>modification</quote>.) Each
    licensee is addressed as <quote>you</quote>.
   </para>
  </formalpara>
  <para>
   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.
  </para>
  <formalpara>
   <title>1.</title>
   <para>
    You may copy and distribute verbatim copies of the Program&rsquo;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.
   </para>
  </formalpara>
  <para>
   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.
  </para>
  <formalpara>
   <title>2.</title>
   <para>
    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:
   </para>
  </formalpara>
  <formalpara>
   <title>a)</title>
   <para>
    You must cause the modified files to carry prominent notices stating
    that you changed the files and the date of any change.
   </para>
  </formalpara>
  <formalpara>
   <title>b)</title>
   <para>
    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.
   </para>
  </formalpara>
  <formalpara>
   <title>c)</title>
   <para>
    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.)
   </para>
  </formalpara>
  <para>
   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.
  </para>
  <para>
   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.
  </para>
  <para>
   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.
  </para>
  <formalpara>
   <title>3.</title>
   <para>
    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:
   </para>
  </formalpara>
  <formalpara>
   <title>a)</title>
   <para>
    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,
   </para>
  </formalpara>
  <formalpara>
   <title>b)</title>
   <para>
    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,
   </para>
  </formalpara>
  <formalpara>
   <title>c)</title>
   <para>
    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.)
   </para>
  </formalpara>
  <para>
   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.
  </para>
  <para>
   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.
  </para>
  <formalpara>
   <title>4.</title>
   <para>
    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.
   </para>
  </formalpara>
  <formalpara>
   <title>5.</title>
   <para>
    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.
   </para>
  </formalpara>
  <formalpara>
   <title>6.</title>
   <para>
    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&rsquo; exercise of the rights granted herein. You are
    not responsible for enforcing compliance by third parties to this
    License.
   </para>
  </formalpara>
  <formalpara>
   <title>7.</title>
   <para>
    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.
   </para>
  </formalpara>
  <para>
   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.
  </para>
  <para>
   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&sol;donor
   to decide if he or she is willing to distribute software through any
   other system and a licensee cannot impose that choice.
  </para>
  <para>
   This section is intended to make thoroughly clear what is believed to be
   a consequence of the rest of this License.
  </para>
  <formalpara>
   <title>8.</title>
   <para>
    If the distribution and&sol;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.
   </para>
  </formalpara>
  <formalpara>
   <title>9.</title>
   <para>
    The Free Software Foundation may publish revised and&sol;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.
   </para>
  </formalpara>
  <para>
   Each version is given a distinguishing version number. If the Program
   specifies a version number of this License which applies to it and
   <quote>any later version</quote>, 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.
  </para>
  <formalpara>
   <title>10.</title>
   <para>
    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.
   </para>
  </formalpara>
  <sect3>
   <title>NO WARRANTY</title>
   <formalpara>
    <title>11.</title>
    <para>
     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&sol;OR OTHER
     PARTIES PROVIDE THE PROGRAM &ldquo;AS IS&rdquo; 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.
    </para>
   </formalpara>
   <formalpara>
    <title>12.</title>
    <para>
     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&sol;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.
    </para>
   </formalpara>
  </sect3>
  <sect3>
   <title>END OF TERMS AND CONDITIONS</title>
   <para></para>
  </sect3>
 </sect2>

 <sect2>
  <title>How to Apply These Terms to Your New Programs</title>
  <para>
   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.
  </para>
  <para>
   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
   <quote>copyright</quote> line and a pointer to where the full notice is
   found.
  </para>
<screen>one line to give the program&rsquo;s name and an idea of what it does. 
Copyright (C) yyyy name of author

This program is free software; you can redistribute it and&sol;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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.</screen>
  <para>
   Also add information on how to contact you by electronic and paper mail.
  </para>
  <para>
   If the program is interactive, make it output a short notice like this
   when it starts in an interactive mode:
  </para>
<screen>Gnomovision version 69, Copyright (C) year name of author
Gnomovision comes with ABSOLUTELY NO WARRANTY; for details
type `show w&rsquo;. This is free software, and you are welcome
to redistribute it under certain conditions; type `show c&rsquo; 
for details.</screen>
  <para>
   The hypothetical commands `show w&rsquo; and `show c&rsquo; should show
   the appropriate parts of the General Public License. Of course, the
   commands you use may be called something other than `show w&rsquo; and
   `show c&rsquo;; they could even be mouse-clicks or menu items--whatever
   suits your program.
  </para>
  <para>
   You should also get your employer (if you work as a programmer) or your
   school, if any, to sign a <quote>copyright disclaimer</quote> for the
   program, if necessary. Here is a sample; alter the names:
  </para>
<screen>Yoyodyne, Inc., hereby disclaims all copyright
interest in the program `Gnomovision&rsquo;
(which makes passes at compilers) written 
by James Hacker.

signature of Ty Coon, 1 April 1989
Ty Coon, President of Vice</screen>
  <para>
   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
   <ulink url="http://www.fsf.org/licenses/lgpl.html">GNU Lesser General
   Public License</ulink> instead of this License.
  </para>
 </sect2>
</sect1>
