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