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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 surren-
der 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�
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”�
ANHANG
