GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc.
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
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 must
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) asserting copyright on the software, and (2) offering you this
License giving you legal permission to copy, distribute and 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
developers' 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 individual 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
make special effort to protect free software's users and developers from
the danger of patents.
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 doing 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 non-source work means all the source
code needed to generate, install, and 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 generally
available 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 object code form needs to
include any copyright notice and licensing information held by the
original authors, in an easily readable (human and machine readable)
form, given that all recipients are to be treated as licensees under
this License.
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 condition 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 the 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 covered work, you waive any legal power to forbid
circumvention of technological measures to the extent such circumvention
is effected by exercising rights under this License with respect to
the covered work, and you disclaim any intention to limit operation or
modification of the work as a means of enforcing your own or third
party legal rights against the work's users.
4. Conveying Verbatim Copies.
You may convey verbatim copies of the Program's source code as you
receive it, in any medium, provided that you conspicuously and
appropriately publish on each copy an appropriate copyright notice;
keep intact all notices stating that this License and any
non-permissive terms added in accord with section 7 apply to the code;
keep intact all notices of the absence of any warranty; and give all
recipients a copy of this License along with the Program.
You may charge any price or no price for each copy that you convey,
and you may offer support or warranty protection for a fee.
5. Conveying Modified Source Versions.
You may convey a work based on the Program, or the modifications to
the Program to produce such a work, in the form of source code under
the terms of section 4, provided that you also meet all of these conditions:
a) The work must carry prominent notices stating that you modified it,
and giving a relevant date.
b) The work must carry prominent notices stating that it is
released under this License and any conditions added under section 7.
This requirement modifies the requirement in section 4 to "keep intact
all notices".
c) You must license the entire work, as a whole, under this License
to anyone who comes into possession of a copy. This License will
therefore apply, along with any applicable section 7 additional terms,
to the whole of the work and all its parts, regardless of how they are
packaged. This License gives no permission to license the work in any
other way, but it does not invalidate such permission if you received
it separately.
d) If the work has interactive user interfaces, each must display
Appropriate Legal Notices; however, if the Program has interactive
interfaces that do not display Appropriate Legal Notices, your work
need not make them do so.
A compilation of a covered work with other separate and independent
works, which are not by their nature extensions of the covered work,
and which are not combined with it such as to form a larger program,
in or on a volume of a storage or distribution medium, is called an
"aggregate" if the compilation and its resulting copyright are not
used to limit the access or legal rights of the compilation's users
beyond what the individual works permit. Inclusion of a covered work
in an aggregate does not cause this License to apply to the other
parts of the aggregate.
6. Conveying Non-Source Forms.
You may convey a covered work in object code form under the terms of
sections 4 and 5, provided that you also convey the
Corresponding Source in a medium customarily used for software interchange.
The Corresponding Source need not include any code, script or data that
you can exclude under section 1 on the basis that it was generated
automatically from other parts of the Corresponding Source.
The Corresponding Source for a work in object code form must be
included in an archive format that is suitable for transferring
software (for instance, a tar file compressed with gzip). However, it
need not include production of a command-line interface, or an embedded
operating system, or other facilities that are required for a recipient
to use the work, but which are not part of the work itself.
The recipient must be able to install and run the modified object code
and use the Corresponding Source, using tools and procedures standard
for the community to which the work belongs.
7. Additional Terms.
"Additional permissions" are terms that supplement the terms of this
License by making exceptions to one or more of its conditions.
"Non-permissive additional terms" are terms that do not make
exceptions. They may be included in the Program's source code, but not
in its object code form.
You may place additional permissions on one or more portions of the
Program's source code, provided that you add an appropriate copyright
notice to each portion and a notice that refers to this License.
You may convey a covered work, if you have received permission from
the copyright holder of the Program, under any terms you wish.
Otherwise, you must not use additional permissions to deny or limit
the user's rights under this License.
8. Termination.
You may not propagate or convey a covered work except as expressly
provided under this License. Any attempt otherwise to propagate or
convey it is void, and will automatically terminate your rights under
this License (including any patent licenses granted under this License)
for that work.
However, if you cease all violation of this License, then your license
from a particular copyright holder is reinstated (a) provisionally,
unless and until the copyright holder explicitly and finally
terminates your license, and (b) permanently, if the copyright holder
fails to notify you of the violation by some reasonable means prior
to 60 days after the cessation.
Moreover, your license from a particular copyright holder is
reinstated permanently if the copyright holder notifies you of the
violation by some reasonable means, this being the first time you have
received notice of violation of this License (for any work) from that
copyright holder, and you cure the violation prior to 30 days after
your receipt of the notice.
Termination of your rights under this section does not terminate the
licenses of parties who have received copies or rights from you under
this License. If your rights have been terminated and not permanently
reinstated, you do not qualify to receive new licenses for the same
material under section 10.
9. Acceptance.
You are not required to accept this License to receive or run a copy of
the Program. Ancillary propagation of a covered work occurring merely
as a consequence of using an electronic network to access public data
does not require acceptance of this License. However, nothing other
than this License grants you permission to propagate or modify any
covered work. These actions infringe copyright if you do not accept
this License. Therefore, by modifying or propagating a covered work,
you indicate your acceptance of this License to do so.
10. Automatic Licensing of Downstream Recipients.
Each time you convey a covered work, the recipient automatically
receives a license from the original licensors, to run, modify and
propagate that work, subject to this License. You may not impose any
further restrictions on the exercise of the rights granted herein. You
are not responsible for enforcing compliance by third parties with
this License.
11. Patents.
A "contributor" is a copyright holder who authorizes use under this
License of the Program or a work on which the Program is based. The
work thus licensed is called the "contributor version".
A contributor's "essential patent claims" are all patent claims
owned or controlled by the contributor, whether already acquired or
hereafter acquired, that would be infringed by making, using, or
selling their contributor version, but do not include claims that would
be infringed only by further modification of the contributor version.
For purposes of this definition, "control" includes the right to grant
patent sublicenses in a manner consistent with the requirements of
this License.
Each contributor grants you a non-exclusive, worldwide, royalty-free
patent license under the contributor's essential patent claims, to make,
use, sell, offer for sale, import and otherwise run, modify and propagate
the contents of its contributor version.
In the following three paragraphs, a "patent license" is any express
agreement or commitment, however denominated, not to enforce a patent
(such as an express permission to practice a patent or covenant not to sue
for patent infringement). To "grant" such a patent license to a party
means to make such an agreement or commitment not to enforce a patent
against the party.
If you convey a covered work, knowingly relying on a patent license in
which the patent license is conditioned on your not granting patent
license to third parties, you grant an automatic patent license to all
downstream recipients to the full extent of the patent license and the
requirements of this License. This includes, but is not limited to, the
full scope of the essential patent claims of any contributor.
If you convey a covered work, and you do not know whether a patent
license is conditioned on your not granting patent license to third
parties, you grant an automatic patent license to all downstream
recipients to the full extent of the patent license and the requirements
of this License. This includes, but is not limited to, the full scope of
the essential patent claims of any contributor.
If you convey a covered work, and you do not know whether a patent
license is conditioned on your not granting patent license to third
parties, you grant an automatic patent license to all downstream
recipients to the full extent of the patent license and the requirements
of this License. This includes, but is not limited to, the full scope of
the essential patent claims of any contributor.
12. No Surrender of Others' Freedom.
If you distribute copies of the Program, you must make sure that they
too receive or can get the source code. You must also make sure that they
receive or can get a copy of this License.
13. General Provisions.
The Free Software Foundation may publish revised and/or new versions of
the GNU General Public License from time to time. Such new versions will
be similar in spirit to the present version, but may differ in detail to
address new problems or concerns.
Each version is given a distinguishing version number. If the Program
specifies that a certain numbered version of this License "or any later
version" applies to it, you have the option of following the terms and
conditions either of that numbered version or of any later version
published by the Free Software Foundation. If the Program does not
specify a version number of this License, you may choose any version
ever published by the Free Software Foundation.
If the Program specifies that a certain numbered version of this License
"or any later version" applies to it, you have the option of following the
terms and conditions either of that numbered version or of any later
version published by the Free Software Foundation. If the Program does
not specify a version number of this License, you may choose any version
ever published by the Free Software Foundation.
14. Limitation of Liability.
The Free Software Foundation and its licensors disclaim all liability
for any damages arising out of your use or inability to use the Program.
15. Indemnification.
The Free Software Foundation and its licensors disclaim all liability
for any damages arising out of your use or inability to use the Program.
16. Waiver.
If you violate this License, the Free Software Foundation and its
licensors reserve the right to pursue all available remedies, including
termination of your license, to the full extent permitted by law.
17. Entire Agreement.
This License constitutes the entire agreement between you and the Free
Software Foundation regarding the Program, and supersedes all prior
agreements and understandings.
18. Severability.
If any provision of this License is held to be invalid or
unenforceable, the remaining provisions will remain in full force and
effect.
19. Governing Law.
This License shall be governed by the laws of the United States of
America, and the parties submit to the exclusive jurisdiction of the
courts of the United States of America.
20. Notices.
You must retain all copyright notices and other proprietary
designations in the Program. You must also include in the source code
a copy of this License and a notice that refers to the License.
21. Contact.
If you have any questions about this License, please contact the Free
Software Foundation at .