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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
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
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