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══════════════════════════════════════
5. 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 entirely written 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 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.
<one line to give the program's name and a brief idea of
what it does.> Copyright (C) 19yy <name of author>
This program is free software; you may 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., 675 Mass Ave, Cambridge, MA
02139, 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) 19yy 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 may 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 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.