    The GNU General Public License (GPL)

    Version 2, June 1991

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

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

    Preamble

    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.

    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.

    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.

    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.

    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/or modify the software.

    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.

    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.

    The precise terms and conditions for copying, distribution and modification
    follow.

    TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION

    0. 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 "Program", below, refers to any such program
    or work, and a "work based on the Program" 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/or
    translated into another language.  (Hereinafter, translation is included
    without limitation in the term "modification".) Each licensee is addressed as
    "you".

    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.

    1. 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.

    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.

    2. 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:

        a) You must cause the modified files to carry prominent notices stating
        that you changed the files and the date of any change.

        b) 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.

        c) 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.)

    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.

    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.

    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.

    3. 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:

        a) 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,

        b) 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,

        c) 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.)

    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.

    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.

    4. 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.

    5. 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.

    6. 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.

    7. 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.

    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.

    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.

    This section is intended to make thoroughly clear what is believed to be a
    consequence of the rest of this License.

    8. 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.

    9. 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.

    Each version is given a distinguishing version number.  If the Program
    specifies a version number of this License which applies to it and "any later
    version", 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.

    10. 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.

    NO WARRANTY

    11. 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 "AS IS" 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.

    12. 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.

    END OF TERMS AND CONDITIONS

    How to Apply These Terms to Your New Programs

    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.

    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 "copyright" line and a
    pointer to where the full notice is found.

        One line to give the program's name and a brief idea of what it does.

        Copyright (C)

        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., 59
        Temple Place, Suite 330, Boston, MA 02111-1307 USA

    Also add information on how to contact you by electronic and paper mail.

    If the program is interactive, make it output a short notice like this when it
    starts in an interactive mode:

        Gnomovision version 69, Copyright (C) year 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.

    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.

    You should also get your employer (if you work as a programmer) or your school,
    if any, to sign a "copyright disclaimer" for the program, if necessary.  Here
    is a sample; alter the names:

        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

    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.

    "CLASSPATH" EXCEPTION TO THE GPL

    Certain source files distributed by Sun Microsystems, Inc.  are subject to
    the following clarification and special exception to the GPL, but only where
    Sun has expressly included in the particular source file's header the words
    "Sun designates this particular file as subject to the "Classpath" exception
    as provided by Sun in the LICENSE file that accompanied this code."

        Linking this library statically or dynamically with other modules is making
        a combined work based on this library.  Thus, the terms and conditions of
        the GNU General Public License cover the whole combination.

        As a special exception, the copyright holders of this library give you
        permission to link this library with independent modules to produce an
        executable, regardless of the license terms of these independent modules,
        and to copy and distribute the resulting executable under terms of your
        choice, provided that you also meet, for each linked independent module,
        the terms and conditions of the license of that module.  An independent
        module is a module which is not derived from or based on this library.  If
        you modify this library, you may extend this exception to your version of
        the library, but you are not obligated to do so.  If you do not wish to do
        so, delete this exception statement from your version.