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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.
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
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 general-
purpose 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.
2. Basic Permissions.
All rights granted under this License are granted for the term of
copyright on the Program, and are irrevocable provided the
stated conditions are met. This License explicitly affirms your
unlimited permission to run the unmodified Program. The
output from running a covered work is covered by this License
only if the output, given its content, constitutes a covered work.
This License acknowledges your rights of fair use or other
equivalent, as provided by copyright law.
You may make, run and propagate covered works that you do
not convey, without conditions so long as your license otherwise
remains in force. You may convey covered works to others for
the sole purpose of having them make modifications exclusively
for you, or provide you with facilities for running those works,
provided that you comply with the terms of this License in
conveying all material for which you do not control copyright.
Those thus making or running the covered works for you must
do so exclusively on your behalf, under your direction and
control, on terms that prohibit them from making any copies of
your copyrighted material outside their relationship with you.
Conveying under any other circumstances is permitted solely
under the conditions stated below. Sublicensing is not allowed;
section 10 makes it unnecessary.
3. Protecting Users' Legal Rights From Anti-Circumvention Law.
No covered work shall be deemed part of an effective
technological measure under any applicable law fulfilling
obligations under article 11 of the WIPO copyright treaty
adopted on 20 December 1996, or similar laws prohibiting or
restricting circumvention of such measures. When you convey a
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