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1989-12-03
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GNU GENERAL PUBLIC LICENSE
Version 1
February 1989
Copyright (C) 1989
Free Software Foundation, Inc.
675 Massachusetts Avenue
Cambridge, Massachusetts 02139
Everyone is permitted to copy and distribute verbatim copies of this
license document, but changing it is not allowed.
PREAMBLE
The license agreements of most software companies try to keep users at
the mercy of those companies. By contrast, our General Public License is
intended to guarantee your freedom to share and change free software--to
make sure the software is free for all users. The General Public License
applies to the Free Software Foundation's software and to any other program
whose authors commit to using it. You can use it for your programs, too.
When we speak of free software, we are referring to freedom, not
price. Specifically, the General Public License is designed to make sure
that you have the freedom to give away or sell copies of free software,
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 free, you must give the recipients all the rights that you
have. You make sure that they, too, receive or can get the source code.
And you must tell them 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.
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 Agreement 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 the Program or any work containing the Program or a portion
of it, either verbatim or with modifications. Each licensee is addressed
as "you."
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 General Public License and to the absence of any
warranty; and give any other recipients of the Program a copy of this
General Public License along with the Program. You may charge a fee for
the physical act of transferring a copy.
2. You may modify your copy or copies of the Program or any portion
of it, and copy and distribute such modifications under the terms of
Paragraph 1 above, provided that you also do the following:
(a) cause the modified files to carry prominent notices stating
that you changed the files and the date of any change; and
(b) cause the whole of the work that you distribute or publish,
that in whole or in part contains the Program or any part
thereof, either with or without modifications, to be licensed at
no charge to all third parties under the terms of this General
Public License (except that you may choose to grant warranty
protection to some or all third parties, at your option).
(c) If the modified program normally reads commands interactively
when run, you must cause it, when started running for such
interactive use in the simplest and most usual 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 General Public License.
(d) 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.
Mere aggregation of another independent work with the Program (or its
derivative) on a volume of storage or distribution medium does not bring
the other work under the scope of these terms.
3. You may copy and distribute the Program (or a portion or
derivative of it, under Paragraph 2) in object code or executable form
under the terms of Paragraphs 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
Paragraphs 1 and 2 above; or,
(b) accompany it with a written offer, valid for at least three
years, to give any third party free (except for a nominal charge
for the cost of distribution) a complete machine-readable copy of
the corresponding source code, to be distributed under the terms
of Paragraphs 1 and 2 above; or,
(c) accompany it with the information you received as to where
the corresponding source code may be obtained. (This alternative
is allowed only for noncommercial distribution and only if you
received the program in object code or executable form alone.)
Source code for a work means the preferred form of the work for making
modifications to it. For an executable file, complete source code means
all the source code for all modules it contains; but, as a special
exception, it need not include source code for modules which are standard
libraries that accompany the operating system on which the executable file
runs, or for standard header files or definitions files that accompany the
operating system.
4. You may not copy, modify, sub-license, distribute, or transfer the
Program except as expressly provided under this General Public License.
Any attempt otherwise to copy, modify, sub-license, distribute, or transfer
the Program is void, and will automatically terminate your rights to use
the Program under this License. However, parties who have received copies,
or rights to use copies, from you under this General Public License will
not have their licenses terminated so long as such parties remain in full
compliance.
5. By copying, distributing, or modifying 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.
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.
7. 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 the 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
the license, you may choose any version ever published by the Free Software
Foundation.
8. 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
9. 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.
10. 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, data being rendered inaccurate, 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