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whose authors committo using it. (Someother Free Software Foundationsoftware 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 (andcharge forthis serviceif youwish), thatyou receivesource codeor canget it ifyou
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 protectyour rights,weneed tomake restrictionsthat forbidanyone todeny youthese rightsor
to ask youto surrender the rights.These restrictions translate tocertain responsibilities for youif
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 rightsthat you have. You must make sure that they,too, receive or can
get the source code.
And you must show them theseterms so they know their rights. We protect your rightswith two
steps: (1) copyright thesoftware, and (2) offer you this licensewhich 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 holdersaying it maybe distributedunder the termsof this GeneralPublic 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 aportion of it, either verbatim orwith modifications and/or translated
into another language. (Hereinafter, translation is included without limitation in the term
“modification”.) Each licensee is addressed as “you”.
Activities otherthan copying, distributionand modification arenot covered bythis 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. Youmay copyand distributeverbatim copiesof theProgram's sourcecode asyou receiveit, 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 modifyyour copy or copies ofthe Program or any portion ofit, 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. Youmust cause themodified files tocarry prominent noticesstating that youchanged 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