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For example, if you distribute copies of such a
program, whether gratis or for a fee, you must
pass on to the recipients the same freedoms that
you received. 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.
Developers that use the GNU GPL protect your
rights with two steps: (1) assert copyright on the
software, and (2) offer you this License giving you
legal permission to copy, distribute and/or modify it.
For the developers' and authors' protection, the
GPL clearly explains that there is no warranty for
this free software. For both users' and authors'
sake, the GPL requires that modifi ed versions be
marked as changed, so that their problems will not
be attributed erroneously to authors of previous
versions.
Some devices are designed to deny users access
to install or run modifi ed versions of the software
inside them, although the manufacturer can do so.
This is fundamentally incompatible with the aim of
protecting users' freedom to change the software.
The systematic pattern of such abuse occurs in
the area of products for individuals to use, which is
precisely where it is most unacceptable. Therefore,
we have designed this version of the GPL to prohibit
the practice for those products. If such problems
arise substantially in other domains, we stand ready
to extend this provision to those domains in future
versions of the GPL, as needed to protect the
freedom of users.
Finally, every program is threatened constantly by
software patents. States should not allow patents
to restrict development and use of software on
general-purpose computers, but in those that do,
we wish to avoid the special danger that patents
applied to a free program could make it effectively
proprietary. To prevent this, the GPL assures that
patents cannot be used to render the program non-
free.
The precise terms and conditions for copying,
distribution and modifi cation follow.
TERMS AND CONDITIONS
0. Defi nitions.
"This License" refers to version 3 of the GNU
General Public License.
"Copyright" also means copyright-like laws
that apply to other kinds of works, such as
semiconductor masks.
"The Program" refers to any copyrightable work
licensed under this License. Each licensee is
addressed as "you". "Licensees" and "recipients"
may be individuals or organizations.
To "modify" a work means to copy from or adapt all
or part of the work in a fashion requiring copyright
permission, other than the making of an exact copy.
The resulting work is called a "modifi ed version"
of the earlier work or a work "based on" the earlier
work.
A "covered work" means either the unmodifi ed
Program or a work based on the Program.
To "propagate" a work means to do anything with it
that, without permission, would make you directly or
secondarily liable for infringement under applicable
copyright law, except executing it on a computer
or modifying a private copy. Propagation includes
copying, distribution (with or without modifi cation),
making available to the public, and in some
countries other activities as well.
To "convey" a work means any kind of propagation
that enables other parties to make or receive
copies. Mere interaction with a user through a
computer network, with no transfer of a copy, is not
conveying.
An interactive user interface displays "Appropriate
Legal Notices" to the extent that it includes a
convenient and prominently visible feature that (1)
displays an appropriate copyright notice, and (2)
tells the user that there is no warranty for the work
(except to the extent that warranties are provided),
that licensees may convey the work under this
License, and how to view a copy of this License.
If the interface presents a list of user commands or
options, such as a menu, a prominent item in the
list meets this criterion.
1. Source Code.
The "source code" for a work means the preferred
form of the work for making modifi cations to it.
"Object code" means any non-source form of a
work.
A "Standard Interface" means an interface that
either is an offi cial standard defi ned by a recognized
standards body, or, in the case of interfaces
specifi ed for a particular programming language,
one that is widely used among developers working
in that language.
The "System Libraries" of an executable work
include anything, other than the work as a whole,
that (a) is included in the normal form of packaging
a Major Component, but which is not part of that
Major Component, and (b) serves only to enable
use of the work with that Major Component, or
to implement a Standard Interface for which an
implementation is available to the public in source
code form. A "Major Component", in this context,
means a major essential component (kernel,
window system, and so on) of the specifi c operating
system (if any) on which the executable work runs,
or a compiler used to produce the work, or an
object code interpreter used to run it.
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