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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
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 Street, 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 Lesser General
Public License instead of this License.