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GNU GENERAL PUBLIC
LICENSE
Version 2, June 1991
Copyright (C) 1989, 1991 Free Software
Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
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 Lesser 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.
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
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