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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 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