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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
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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
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The “System Libraries” of an executable work include
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in the normal form of packaging a Major Component,
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Component, or to implement a Standard Interface for which
an implementation is available to the public in source code
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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
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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.
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.