you modify it: responsibilities to respect the
freedom of others.
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 modified 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 modified 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 modification
follow.
TERMS AND CONDITIONS
0. Definitions.
“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 “modified version” of the earlier work
or a work “based on” the earlier work.
A “covered work” means either the unmodified
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
modification), 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
