<appendix id="licenses-gpl">

    <title>GNU General Public License</title>

    <para>

        Version 2, June 1991

    </para>

    <para>

        Copyright © 1989, 1991 Free Software Foundation, Inc.

        675 Mass Ave, Cambridge, MA 02139, USA

</para>

    <para>

        Everyone is permitted to copy and distribute verbatim copies

        of this license document, but changing it is not

        allowed.

    </para>

    <sect1 id="licenses-gpl-0" xreflabel="Preamble">

    <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'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:

    </para>

    <orderedlist numeration="arabic">

        <listitem>

            <para>copyright the software, and</para> 

        </listitem>

        <listitem>

            <para>offer you this license which gives you legal

            permission to copy, distribute and/or modify the

            software.</para>

        </listitem>

    </orderedlist>

    <para>

        Also, for each author's protection and ours, we want to make

        certain that everyone understands that there is no warranty

        for this free software.  If the software is modified by

        someone else and passed on, we want its recipients to know

        that what they have is not the original, so that any problems

        introduced by others will not reflect on the original authors'

        reputations.

    </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's free use or not licensed at all.

    </para>

    <para>

        The precise terms and conditions for copying, distribution and

        modification follow.

    </para> 

    </sect1>

    <sect1 id="licenses-gpl-1">

    <title>Terms and Conditions for Copying, Distribution and Modification</title>

    <sect2 id="licenses-gpl-1-1" xreflabel="Section 1">

    <title>Section 1</title>

    <para>

        You may copy and distribute verbatim copies of the Program's

        source code as you receive it, in any medium, provided that

        you conspicuously and appropriately publish on each copy an

        appropriate copyright notice and disclaimer of warranty; keep

        intact all the notices that refer to this License and to the

        absence of any warranty; and give any other recipients of the

        Program a copy of this License along with the Program.

    </para>

    <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>

    </sect2>

    <sect2 id="licenses-gpl-1-2" xreflabel="Section 2">

    <title>Section 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 <xref linkend="licenses-gpl-1-1" /> above, provided that

        you also meet all of these conditions:

    </para>

   <orderedlist numeration="loweralpha">

   <listitem>

   <para>

        You must cause the modified files to carry prominent notices

        stating that you changed the files and the date of any

        change.

    </para>

   </listitem>

   <listitem>

   <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>

    </listitem>

    <listitem>

    <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.

    </para>  

    </listitem>

    </orderedlist>

    <note>

    <title>Exception</title>

    <para>

        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>

    </note>

    <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>

    </sect2>

    <sect2 id="licenses-gpl-1-3" xreflabel="Section 3">

    <title>Section 3</title>

    <para>

        You may copy and distribute the Program (or a work based on

        it, under <xref linkend="licenses-gpl-1-2" />) in object code

        or executable form under the terms of 

        linkend="licenses-gpl-1-1" /> and 

        linkend="licenses-gpl-1-2" /> above provided that you also do

        one of the following:

    </para>

    <orderedlist numeration="loweralpha">

    <listitem>

    <para>

        Accompany it with the complete corresponding machine-readable

        source code, which must be distributed under the terms of

        <xref linkend="licenses-gpl-1-1" /> and 

        linkend="licenses-gpl-1-2" /> above on a medium customarily

        used for software interchange; or,

    </para>

    </listitem>

    <listitem>

    <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 

        linkend="licenses-gpl-1-1" /> and 

        linkend="licenses-gpl-1-2" /> above on a medium customarily

        used for software interchange; or,

    </para>

    </listitem>

    <listitem>

    <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>

    </listitem>

    </orderedlist>

    <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>

    </sect2>

    <sect2 id="licenses-gpl-1-4" xreflabel="Section 4">

    <title>Section 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>

    </sect2>

    <sect2 id="licenses-gpl-1-5" xreflabel="Section 5">

    <title>Section 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>

    </sect2>

        <sect2 id="licenses-gpl-1-6" xreflabel="Section 6">

            <title>Section 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' exercise of the rights

            granted herein.  You are not responsible for enforcing compliance

            by third parties to this License.</para>

       </sect2>

       <sect2 id="licenses-gpl-1-7" xreflabel="Section 7">

            <title>Section 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>

            <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/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>

        </sect2>

        <sect2 id="licenses-gpl-1-8" xreflabel="Section 8">

            <title>Section 8</title>

            <para>If the distribution and/or use of the Program is restricted

            in certain countries either by patents or by copyrighted

            interfaces, the original copyright holder who places the Program

            under this License may add an explicit geographical distribution

            limitation excluding those countries, so that distribution is

            permitted only in or among countries not thus excluded.  In such

            case, this License incorporates the limitation as if written in

            the body of this License.</para>

       </sect2>

       <sect2 id="licenses-gpl-1-9" xreflabel="Section 9">

            <title>Section 9</title>

            <para>The Free Software Foundation may publish revised and/or new

            versions of the General Public License from time to time.  Such

            new versions will be similar in spirit to the present version, but

            may differ in detail to address new problems or concerns.</para>

            <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>

       </sect2>

       <sect2 id="licenses-gpl-1-10" xreflabel="Section 10">

       <title>Section 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>

        </sect2>

        <sect2 id="licenses-gpl-1-11" xreflabel="NO WARRANTY">

        <title>NO WARRANTY</title>

        <subtitle>Section 11</subtitle>

            <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/OR OTHER PARTIES PROVIDE THE PROGRAM <quote>AS IS</quote> 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>

       </sect2>

       <sect2 id="licenses-gpl-1-12" xreflabel="Section 12">

            <title>Section 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/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>

            <para><emphasis>End of Terms and Conditions.</emphasis></para>

        </sect2>

    </sect1>

    <sect1 id="licenses-gpl-2" xreflabel="How to Apply These Terms to Your New Programs">

        <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's name and a brief idea of what it does.>

Copyright (C) 19yy  <name of author>

This program is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 2 of the License, or

(at your option) any later version.

This program is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

GNU General Public License for more details.

You should have received a copy of the GNU General Public License

along with this program; if not, write to the Free Software

Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, 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) 19yy name of author

Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.

This is free software, and you are welcome to redistribute it

under certain conditions; type `show c' for details.

</screen>

        <para>The hypothetical commands `show w' and `show c' should

        show the appropriate parts of the General Public License.  Of

        course, the commands you use may be called something other

        than `show w' and `show c'; they could even be mouse-clicks or

        menu items–whatever suits your program.</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' (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 GNU Library

        General Public License instead of this License.</para>

    </sect1>

</appendix>