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preamble
The GNU General Public License is a free, copyleft license
for software and other kinds of works. The licenses for
most software and other practical works are designed to
take away your freedom to share and change the works.
By contrast, the GNU General Public License is intended to
guarantee your freedom to share and change all versions
of a program--to make sure it remains free software for all
its users.
We, the Free Software Foundation, use the GNU General
Public License for most of our software; it applies also to any
other work released this way by its authors.
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 them 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 prevent others from
denying you these rights or asking you to surrender
the rights. Therefore, you have certain responsibilities if
you distribute copies of the software, or if 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
omputers, but in those that do, we wish to avoid the special
anger that patents applied to a free program could make it
ffectively proprietary. To prevent this, the GPL assures that
atents cannot be used to render the program non-free. he
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 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 modifications to it. "Object code" means
any non-source form of a work.
A "Standard Interface" means an interface that either is
an official standard defined by a recognized standards
body, or, in the case of interfaces specified 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 specific 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.
The "Corresponding Source" for a work in object code
form means all the source code needed to generate, install,
and (for an executable work) run the object code and to
modify the work, including scripts to control those activities.
However, it does not include the work's System Libraries,
or generalpurpose tools or generally available free programs
which are used unmodified in performing those activities but
which are not part of the work. For example, Corresponding
Source includes interface definition files associated with
source files for the work, and the source code for shared
libraries and dynamically linked subprograms that the work
is specifically designed to require, such as by intimate data
communication or control flow between those subprograms
and other parts of the work.
The Corresponding Source need not include anything that
users can regenerate automatically from other parts of the
Corresponding Source. The Corresponding Source for a
work in source code form is that same work.
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