GNU GENERAL PUBLIC LICENSE Version 2, June 1991 Copyright (C) 1989,
1991 Free Software Foundation, Inc. 675 Mass Ave, Cambridge, MA 02139,
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
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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. GNU GENERAL PUBLIC LICENSE 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 Appendix: 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.