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<acronym>GNU</acronym> General Public License version 3
Version 3, 29 June 2007
Copyright © 2007 Free Software Foundation, Inc.
http://fsf.org/
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
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For example, if you distribute copies of such a program, whether gratis or
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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.
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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
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Some devices are designed to deny users access to install or run modified
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This is fundamentally incompatible with the aim of protecting users’
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is most unacceptable. Therefore, we have designed this version of the
GPL to prohibit the practice for those products. If such
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as needed to protect the freedom of users.
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assures that patents cannot be used to render the program non-free.
The precise terms and conditions for copying, distribution and modification
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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
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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.
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other parties to make or receive copies. Mere interaction with a user
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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)
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that warranties are provided), that licensees may convey the work under this
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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
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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
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You may make, run and propagate covered works that you do not convey,
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may convey covered works to others for the sole purpose of having them make
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You may convey verbatim copies of the Program’s source code as you
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notices”.
You must license the entire work, as a whole, under this License to
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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
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You may convey a covered work in object code form under the terms of
sections 4 and 5, provided that you also convey the machine-readable
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Convey the object code in, or embodied in, a physical product (including
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Convey the object code in, or embodied in, a physical product (including
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for at least three years and valid for as long as you offer spare parts
or customer support for that product model, to give anyone who possesses
the object code either (1) a copy of the Corresponding Source for all
the software in the product that is covered by this License, on a
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Convey individual copies of the object code with a copy of the written
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If you convey an object code work under this section in, or with, or
specifically for use in, a User Product, and the conveying occurs as part of
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Product (for example, the work has been installed in
ROM ).
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Corresponding Source conveyed, and Installation Information provided, in
accord with this section must be in a format that is publicly documented
(and with an implementation available to the public in source code form),
and must require no special password or key for unpacking, reading or
copying.
7. Additional Terms.
“Additional permissions” are terms that supplement the terms of
this License by making exceptions from one or more of its conditions.
Additional permissions that are applicable to the entire Program shall be
treated as though they were included in this License, to the extent that
they are valid under applicable law. If additional permissions apply only
to part of the Program, that part may be used separately under those
permissions, but the entire Program remains governed by this License
without regard to the additional permissions.
When you convey a copy of a covered work, you may at your option remove any
additional permissions from that copy, or from any part of it. (Additional
permissions may be written to require their own removal in certain cases
when you modify the work.) You may place additional permissions on
material, added by you to a covered work, for which you have or can give
appropriate copyright permission.
Notwithstanding any other provision of this License, for material you add
to a covered work, you may (if authorized by the copyright holders of that
material) supplement the terms of this License with terms:
Disclaiming warranty or limiting liability differently from the terms
of sections 15 and 16 of this License; or
Requiring preservation of specified reasonable legal notices or author
attributions in that material or in the Appropriate Legal Notices
displayed by works containing it; or
Prohibiting misrepresentation of the origin of that material, or
requiring that modified versions of such material be marked in
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Limiting the use for publicity purposes of names of licensors or
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names, trademarks, or service marks; or
Requiring indemnification of licensors and authors of that material by
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liability that these contractual assumptions directly impose on those
licensors and authors.
All other non-permissive additional terms are considered “further
restrictions” within the meaning of section 10. If the Program as
you received it, or any part of it, contains a notice stating that it is
governed by this License along with a term that is a further restriction,
you may remove that term. If a license document contains a further
restriction but permits relicensing or conveying under this License, you
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document, provided that the further restriction does not survive such
relicensing or conveying.
If you add terms to a covered work in accord with this section, you must
place, in the relevant source files, a statement of the additional terms
that apply to those files, or a notice indicating where to find the
applicable terms.
Additional terms, permissive or non-permissive, may be stated in the form
of a separately written license, or stated as exceptions; the above
requirements apply either way.
8. Termination.
You may not propagate or modify a covered work except as expressly provided
under this License. Any attempt otherwise to propagate or modify it is
void, and will automatically terminate your rights under this License
(including any patent licenses granted under the third paragraph of section
11).
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 is 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 Not Required for Having Copies.
You are not required to accept this License in order to receive or run a
copy of the Program. Ancillary propagation of a covered work occurring
solely as a consequence of using peer-to-peer transmission to receive a
copy likewise does not require acceptance. 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 are not responsible for enforcing
compliance by third parties with this License.
An “entity transaction” is a transaction transferring control
of an organization, or substantially all assets of one, or subdividing an
organization, or merging organizations. If propagation of a covered work
results from an entity transaction, each party to that transaction who
receives a copy of the work also receives whatever licenses to the work the
party’s predecessor in interest had or could give under the previous
paragraph, plus a right to possession of the Corresponding Source of the
work from the predecessor in interest, if the predecessor has it or can get
it with reasonable efforts.
You may not impose any further restrictions on the exercise of the rights
granted or affirmed under this License. For example, you may not impose a
license fee, royalty, or other charge for exercise of rights granted under
this License, and you may not initiate litigation (including a cross-claim
or counterclaim in a lawsuit) alleging that any patent claim is infringed
by making, using, selling, offering for sale, or importing the Program or
any portion of it.
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’s “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 some manner, permitted by
this License, of making, using, or selling its contributor version, but do
not include claims that would be infringed only as a consequence of 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, and the
Corresponding Source of the work is not available for anyone to copy, free
of charge and under the terms of this License, through a publicly available
network server or other readily accessible means, then you must either (1)
cause the Corresponding Source to be so available, or (2) arrange to deprive
yourself of the benefit of the patent license for this particular work, or
(3) arrange, in a manner consistent with the requirements of this License,
to extend the patent license to downstream recipients. “Knowingly
relying” means you have actual knowledge that, but for the patent
license, your conveying the covered work in a country, or your
recipient’s use of the covered work in a country, would infringe one
or more identifiable patents in that country that you have reason to believe
are valid.
If, pursuant to or in connection with a single transaction or arrangement,
you convey, or propagate by procuring conveyance of, a covered work, and
grant a patent license to some of the parties receiving the covered work
authorizing them to use, propagate, modify or convey a specific copy of the
covered work, then the patent license you grant is automatically extended to
all recipients of the covered work and works based on it.
A patent license is “discriminatory” if it does not include
within the scope of its coverage, prohibits the exercise of, or is
conditioned on the non-exercise of one or more of the rights that are
specifically granted under this License. You may not convey a covered work
if you are a party to an arrangement with a third party that is in the
business of distributing software, under which you make payment to the third
party based on the extent of your activity of conveying the work, and under
which the third party grants, to any of the parties who would receive the
covered work from you, a discriminatory patent license (a) in connection
with copies of the covered work conveyed by you (or copies made from those
copies), or (b) primarily for and in connection with specific products or
compilations that contain the covered work, unless you entered into that
arrangement, or that patent license was granted, prior to 28 March 2007.
Nothing in this License shall be construed as excluding or limiting any
implied license or other defenses to infringement that may otherwise be
available to you under applicable patent law.
12. No Surrender of Others’ Freedom.
If conditions are imposed on you (whether by court order, agreement or
otherwise) that contradict the conditions of this License, they do not
excuse you from the conditions of this License. If you cannot convey a
covered work so as to satisfy simultaneously your obligations under this
License and any other pertinent obligations, then as a consequence you may
not convey it at all. For example, if you agree to terms that obligate you
to collect a royalty for further conveying from those to whom you convey the
Program, the only way you could satisfy both those terms and this License
would be to refrain entirely from conveying the Program.
13. Use with the GNU Affero General Public License.
Notwithstanding any other provision of this License, you have permission to
link or combine any covered work with a work licensed under version 3 of the
GNU Affero General Public License into a single combined
work, and to convey the resulting work. The terms of this License will
continue to apply to the part which is the covered work, but the special
requirements of the GNU Affero General Public License,
section 13, concerning interaction through a network will apply to the
combination as such.
14. Revised Versions of this License.
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 the GNU
General Public 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 the
GNU General Public License, you may choose any version
ever published by the Free Software Foundation.
If the Program specifies that a proxy can decide which future versions of
the GNU General Public License can be used, that
proxy’s public statement of acceptance of a version permanently
authorizes you to choose that version for the Program.
Later license versions may give you additional or different permissions.
However, no additional obligations are imposed on any author or copyright
holder as a result of your choosing to follow a later version.
15. Disclaimer of Warranty.
THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE
LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR
OTHER PARTIES PROVIDE THE PROGRAM “AS IS” WITHOUT WARRANTY OF
ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH
YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL
NECESSARY SERVICING, REPAIR OR CORRECTION.
16. Limitation of Liability.
IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL
ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS THE
PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE
OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA
OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
SUCH DAMAGES.
17. Interpretation of Sections 15 and 16.
If the disclaimer of warranty and limitation of liability provided above
cannot be given local legal effect according to their terms, reviewing
courts shall apply local law that most closely approximates an absolute
waiver of all civil liability in connection with the Program, unless a
warranty or assumption of liability accompanies a copy of the Program in
return for a fee.
END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest possible
use to the public, the best way to achieve this is to make it free software
which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest to
attach them to the start of each source file to most effectively state the
exclusion of warranty; and each file should have at least the
“copyright” line and a pointer to where the full notice is
found.
one line to give the program’s name and a brief idea of what it does.
Copyright (C) year name of author
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see http://www.gnu.org/licenses/ .
Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short notice like
this when it starts in an interactive mode:
program Copyright (C) year name of author
This program comes with ABSOLUTELY NO WARRANTY; for details type ‘show w ’.
This is free software, and you are welcome to redistribute it
under certain conditions; type ‘show c ’ for details.
The hypothetical commands ‘show w ’ and
‘show c ’ should show the appropriate parts of
the General Public License. Of course, your program’s commands might be
different; for a GUI interface, you would use an “about box”.
You should also get your employer (if you work as a programmer) or school,
if any, to sign a “copyright disclaimer” for the program, if
necessary. For more information on this, and how to apply and follow the
GNU GPL , see
http://www.gnu.org/licenses/ .
The GNU General Public License does not permit
incorporating your program into proprietary programs. If your program is a
subroutine library, you may consider it more useful to permit linking
proprietary applications with the library. If this is what you want to do,
use the GNU Lesser General Public License instead of this
License. But first, please read http://www.gnu.org/philosophy/why-not-lgpl.html .
