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<appendix id="licenses-gpl">
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    <title>GNU General Public License</title>
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    <para>
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        Version 2, June 1991
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    </para>
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    <para>
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        Copyright © 1989, 1991 Free Software Foundation, Inc.
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        675 Mass Ave, Cambridge, MA 02139, USA
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</para>
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    <para>
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        Everyone is permitted to copy and distribute verbatim copies
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        of this license document, but changing it is not
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        allowed.
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    </para>
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    <sect1 id="licenses-gpl-0" xreflabel="Preamble">
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    <title>Preamble</title>
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    <para>
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        The licenses for most software are designed to take away your
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        freedom to share and change it.  By contrast, the GNU General
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        Public License is intended to guarantee your freedom to share
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        and change free software–to make sure the software is
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        free for all its users.  This General Public License applies
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        to most of the Free Software Foundation's software and to any
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        other program whose authors commit to using it.  (Some other
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        Free Software Foundation software is covered by the GNU
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        Library General Public License instead.)  You can apply it to
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        your programs, too.
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    </para>
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    <para>
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        When we speak of free software, we are referring to freedom,
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        not price.  Our General Public Licenses are designed to make
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        sure that you have the freedom to distribute copies of free
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        software (and charge for this service if you wish), that you
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        receive source code or can get it if you want it, that you can
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        change the software or use pieces of it in new free programs;
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        and that you know you can do these things.
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    </para>
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    <para>
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        To protect your rights, we need to make restrictions that
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        forbid anyone to deny you these rights or to ask you to
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        surrender the rights.  These restrictions translate to certain
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        responsibilities for you if you distribute copies of the
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        software, or if you modify it.
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    </para>
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    <para>
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        For example, if you distribute copies of such a program,
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        whether gratis or for a fee, you must give the recipients all
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        the rights that you have.  You must make sure that they, too,
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        receive or can get the source code.  And you must show them
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        these terms so they know their rights.
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    </para>
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    <para>
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        We protect your rights with two steps:
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    </para>
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    <orderedlist numeration="arabic">
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        <listitem>
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            <para>copyright the software, and</para> 
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        </listitem>
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        <listitem>
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            <para>offer you this license which gives you legal
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            permission to copy, distribute and/or modify the
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            software.</para>
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        </listitem>
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    </orderedlist>
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    <para>
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        Also, for each author's protection and ours, we want to make
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        certain that everyone understands that there is no warranty
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        for this free software.  If the software is modified by
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        someone else and passed on, we want its recipients to know
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        that what they have is not the original, so that any problems
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        introduced by others will not reflect on the original authors'
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        reputations.
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    </para>
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    <para>
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        Finally, any free program is threatened constantly by software
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        patents.  We wish to avoid the danger that redistributors of a
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        free program will individually obtain patent licenses, in
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        effect making the program proprietary.  To prevent this, we
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        have made it clear that any patent must be licensed for
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        everyone's free use or not licensed at all.
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    </para>
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    <para>
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        The precise terms and conditions for copying, distribution and
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        modification follow.
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    </para> 
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    </sect1>
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    <sect1 id="licenses-gpl-1">
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    <title>Terms and Conditions for Copying, Distribution and Modification</title>
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    <sect2 id="licenses-gpl-1-1" xreflabel="Section 1">
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    <title>Section 1</title>
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    <para>
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        You may copy and distribute verbatim copies of the Program's
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        source code as you receive it, in any medium, provided that
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        you conspicuously and appropriately publish on each copy an
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        appropriate copyright notice and disclaimer of warranty; keep
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        intact all the notices that refer to this License and to the
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        absence of any warranty; and give any other recipients of the
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        Program a copy of this License along with the Program.
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    </para>
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    <para>
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        You may charge a fee for the physical act of transferring a
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        copy, and you may at your option offer warranty protection in
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        exchange for a fee.
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    </para>
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    </sect2>
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    <sect2 id="licenses-gpl-1-2" xreflabel="Section 2">
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    <title>Section 2</title>
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    <para>  
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        You may modify your copy or copies of the Program or any
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        portion of it, thus forming a work based on the Program, and
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        copy and distribute such modifications or work under the terms
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        of <xref linkend="licenses-gpl-1-1" /> above, provided that
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        you also meet all of these conditions:
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    </para>
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   <orderedlist numeration="loweralpha">
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   <listitem>
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   <para>
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        You must cause the modified files to carry prominent notices
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        stating that you changed the files and the date of any
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        change.
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    </para>
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   </listitem>
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   <listitem>
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   <para>
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        You must cause any work that you distribute or publish, that
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        in whole or in part contains or is derived from the Program or
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        any part thereof, to be licensed as a whole at no charge to
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        all third parties under the terms of this License.
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    </para>
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    </listitem>
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    <listitem>
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    <para>
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        If the modified program normally reads commands interactively
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        when run, you must cause it, when started running for such
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        interactive use in the most ordinary way, to print or display
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        an announcement including an appropriate copyright notice and
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        a notice that there is no warranty (or else, saying that you
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        provide a warranty) and that users may redistribute the
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        program under these conditions, and telling the user how to
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        view a copy of this License.
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    </para>  
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    </listitem>
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    </orderedlist>
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    <note>
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    <title>Exception</title>
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    <para>
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        If the Program itself is interactive but does not normally
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        print such an announcement, your work based on the Program is
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        not required to print an announcement.
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    </para>
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    </note>
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    <para>
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        These requirements apply to the modified work as a whole.  If
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        identifiable sections of that work are not derived from the
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        Program, and can be reasonably considered independent and
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        separate works in themselves, then this License, and its
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        terms, do not apply to those sections when you distribute them
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        as separate works.  But when you distribute the same sections
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        as part of a whole which is a work based on the Program, the
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        distribution of the whole must be on the terms of this
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        License, whose permissions for other licensees extend to the
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        entire whole, and thus to each and every part regardless of
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        who wrote it.
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    </para>
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    <para>
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        Thus, it is not the intent of this section to claim rights or
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        contest your rights to work written entirely by you; rather,
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        the intent is to exercise the right to control the
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        distribution of derivative or collective works based on the
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        Program.
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    </para>
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    <para>
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        In addition, mere aggregation of another work not based on the
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        Program with the Program (or with a work based on the Program)
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        on a volume of a storage or distribution medium does not bring
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        the other work under the scope of this License.
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    </para>
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    </sect2>
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    <sect2 id="licenses-gpl-1-3" xreflabel="Section 3">
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    <title>Section 3</title>
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    <para>
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        You may copy and distribute the Program (or a work based on
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        it, under <xref linkend="licenses-gpl-1-2" />) in object code
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        or executable form under the terms of 
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        linkend="licenses-gpl-1-1" /> and 
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        linkend="licenses-gpl-1-2" /> above provided that you also do
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        one of the following:
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    </para>
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    <orderedlist numeration="loweralpha">
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    <listitem>
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    <para>
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        Accompany it with the complete corresponding machine-readable
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        source code, which must be distributed under the terms of
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        <xref linkend="licenses-gpl-1-1" /> and 
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        linkend="licenses-gpl-1-2" /> above on a medium customarily
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        used for software interchange; or,
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    </para>
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    </listitem>
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    <listitem>
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    <para>
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        Accompany it with a written offer, valid for at least three
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        years, to give any third party, for a charge no more than your
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        cost of physically performing source distribution, a complete
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        machine-readable copy of the corresponding source code, to be
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        distributed under the terms of 
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        linkend="licenses-gpl-1-1" /> and 
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        linkend="licenses-gpl-1-2" /> above on a medium customarily
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        used for software interchange; or,
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    </para>
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    </listitem>
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    <listitem>
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    <para>
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        Accompany it with the information you received as to the offer
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        to distribute corresponding source code.  (This alternative is
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        allowed only for noncommercial distribution and only if you
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        received the program in object code or executable form with
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        such an offer, in accord with Subsection b above.)
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    </para>
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    </listitem>
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    </orderedlist>
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    <para>
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        The source code for a work means the preferred form of the
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        work for making modifications to it.  For an executable work,
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        complete source code means all the source code for all modules
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        it contains, plus any associated interface definition files,
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        plus the scripts used to control compilation and installation
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        of the executable.  However, as a special exception, the
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        source code distributed need not include anything that is
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        normally distributed (in either source or binary form) with
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        the major components (compiler, kernel, and so on) of the
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        operating system on which the executable runs, unless that
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        component itself accompanies the executable.
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    </para>
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    <para>
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        If distribution of executable or object code is made by
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        offering access to copy from a designated place, then offering
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        equivalent access to copy the source code from the same place
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        counts as distribution of the source code, even though third
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        parties are not compelled to copy the source along with the
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        object code.
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    </para>
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    </sect2>
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    <sect2 id="licenses-gpl-1-4" xreflabel="Section 4">
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    <title>Section 4</title>
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    <para>
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        You may not copy, modify, sublicense, or distribute the
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        Program except as expressly provided under this License.  Any
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        attempt otherwise to copy, modify, sublicense or distribute
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        the Program is void, and will automatically terminate your
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        rights under this License.  However, parties who have received
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        copies, or rights, from you under this License will not have
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        their licenses terminated so long as such parties remain in
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        full compliance.
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    </para>
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    </sect2>
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    <sect2 id="licenses-gpl-1-5" xreflabel="Section 5">
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    <title>Section 5</title>
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    <para>
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        You are not required to accept this License, since you have
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        not signed it.  However, nothing else grants you permission to
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        modify or distribute the Program or its derivative works.
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        These actions are prohibited by law if you do not accept this
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        License.  Therefore, by modifying or distributing the Program
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        (or any work based on the Program), you indicate your
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        acceptance of this License to do so, and all its terms and
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        conditions for copying, distributing or modifying the Program
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        or works based on it.
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    </para>
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    </sect2>
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        <sect2 id="licenses-gpl-1-6" xreflabel="Section 6">
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            <title>Section 6</title>
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            <para>Each time you redistribute the Program (or any work based on
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            the Program), the recipient automatically receives a license from
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            the original licensor to copy, distribute or modify the Program
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            subject to these terms and conditions.  You may not impose any
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            further restrictions on the recipients' exercise of the rights
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            granted herein.  You are not responsible for enforcing compliance
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            by third parties to this License.</para>
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       </sect2>
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       <sect2 id="licenses-gpl-1-7" xreflabel="Section 7">
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            <title>Section 7</title>
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            <para>If, as a consequence of a court judgment or allegation of
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            patent infringement or for any other reason (not limited to patent
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            issues), conditions are imposed on you (whether by court order,
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            agreement or otherwise) that contradict the conditions of this
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            License, they do not excuse you from the conditions of this
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            License.  If you cannot distribute so as to satisfy simultaneously
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            your obligations under this License and any other pertinent
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            obligations, then as a consequence you may not distribute the
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            Program at all.  For example, if a patent license would not permit
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            royalty-free redistribution of the Program by all those who
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            receive copies directly or indirectly through you, then the only
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            way you could satisfy both it and this License would be to refrain
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            entirely from distribution of the Program.</para>
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            <para>If any portion of this section is held invalid or
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            unenforceable under any particular circumstance, the balance of
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            the section is intended to apply and the section as a whole is
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            intended to apply in other circumstances.</para>
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            <para>It is not the purpose of this section to induce you to
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            infringe any patents or other property right claims or to contest
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            validity of any such claims; this section has the sole purpose of
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            protecting the integrity of the free software distribution system,
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            which is implemented by public license practices.  Many people
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            have made generous contributions to the wide range of software
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            distributed through that system in reliance on consistent
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            application of that system; it is up to the author/donor to decide
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            if he or she is willing to distribute software through any other
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            system and a licensee cannot impose that choice.</para>
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            <para>This section is intended to make thoroughly clear what is
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            believed to be a consequence of the rest of this License.</para>
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        </sect2>
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        <sect2 id="licenses-gpl-1-8" xreflabel="Section 8">
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            <title>Section 8</title>
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            <para>If the distribution and/or use of the Program is restricted
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            in certain countries either by patents or by copyrighted
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            interfaces, the original copyright holder who places the Program
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            under this License may add an explicit geographical distribution
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            limitation excluding those countries, so that distribution is
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            permitted only in or among countries not thus excluded.  In such
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            case, this License incorporates the limitation as if written in
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            the body of this License.</para>
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       </sect2>
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       <sect2 id="licenses-gpl-1-9" xreflabel="Section 9">
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            <title>Section 9</title>
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            <para>The Free Software Foundation may publish revised and/or new
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            versions of the General Public License from time to time.  Such
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            new versions will be similar in spirit to the present version, but
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            may differ in detail to address new problems or concerns.</para>
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            <para>Each version is given a distinguishing version number.  If
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            the Program specifies a version number of this License which
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            applies to it and <quote>any later version</quote>, you have the
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            option of following the terms and conditions either of that
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            version or of any later version published by the Free Software
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            Foundation.  If the Program does not specify a version number of
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            this License, you may choose any version ever published by the
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            Free Software Foundation.</para>
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       </sect2>
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       <sect2 id="licenses-gpl-1-10" xreflabel="Section 10">
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       <title>Section 10</title>
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            <para>If you wish to incorporate parts of the Program into other
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            free programs whose distribution conditions are different, write
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            to the author to ask for permission.  For software which is
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            copyrighted by the Free Software Foundation, write to the Free
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            Software Foundation; we sometimes make exceptions for this.  Our
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            decision will be guided by the two goals of preserving the free
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            status of all derivatives of our free software and of promoting
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            the sharing and reuse of software generally.</para>
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        </sect2>
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        <sect2 id="licenses-gpl-1-11" xreflabel="NO WARRANTY">
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        <title>NO WARRANTY</title>
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        <subtitle>Section 11</subtitle>
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            <para>BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO
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            WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE
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            LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
ae0b00
            HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM <quote>AS IS</quote> WITHOUT
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            WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT
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            NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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            FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS TO THE
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            QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
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            PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY
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            SERVICING, REPAIR OR CORRECTION.</para>
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       </sect2>
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       <sect2 id="licenses-gpl-1-12" xreflabel="Section 12">
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            <title>Section 12</title>
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            <para>IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO
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            IN WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY
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            MODIFY AND/OR REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE
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            LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL,
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            INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR
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            INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
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            DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU
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            OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY
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            OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN
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            ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.</para>
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            <para><emphasis>End of Terms and Conditions.</emphasis></para>
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        </sect2>
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    </sect1>
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    <sect1 id="licenses-gpl-2" xreflabel="How to Apply These Terms to Your New Programs">
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        <title>How to Apply These Terms to Your New Programs</title>
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        <para>If you develop a new program, and you want it to be of
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        the greatest possible use to the public, the best way to
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        achieve this is to make it free software which everyone can
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        redistribute and change under these terms.</para>
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        <para>To do so, attach the following notices to the program.
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        It is safest to attach them to the start of each source file
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        to most effectively convey the exclusion of warranty; and each
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        file should have at least the <quote>copyright</quote> line
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        and a pointer to where the full notice is found.</para>
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<screen>
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<one line to give the program's name and a brief idea of what it does.>
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Copyright (C) 19yy  <name of author>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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</screen>
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        <para>Also add information on how to contact you by electronic
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        and paper mail.</para>
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        <para>If the program is interactive, make it output a short
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        notice like this when it starts in an interactive mode:</para>
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<screen>
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Gnomovision version 69, Copyright (C) 19yy name of author
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Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
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This is free software, and you are welcome to redistribute it
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under certain conditions; type `show c' for details.
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</screen>
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        <para>The hypothetical commands `show w' and `show c' should
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        show the appropriate parts of the General Public License.  Of
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        course, the commands you use may be called something other
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        than `show w' and `show c'; they could even be mouse-clicks or
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        menu items–whatever suits your program.</para>
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        <para>You should also get your employer (if you work as a
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        programmer) or your school, if any, to sign a <quote>copyright
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        disclaimer</quote> for the program, if necessary.  Here is a
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        sample; alter the names:</para>
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<screen>
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Yoyodyne, Inc., hereby disclaims all copyright interest in the program
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`Gnomovision' (which makes passes at compilers) written by James Hacker.
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<signature of Ty Coon>, 1 April 1989
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Ty Coon, President of Vice
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</screen>
ae0b00
        
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        <para>This General Public License does not permit
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        incorporating your program into proprietary programs.  If your
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        program is a subroutine library, you may consider it more
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        useful to permit linking proprietary applications with the
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        library.  If this is what you want to do, use the GNU Library
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        General Public License instead of this License.</para>
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    </sect1>
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</appendix>