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November 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
The GNU Affero General Public License is a free, copyleft license
for software and other kinds of works, specifically designed to
ensure cooperation with the community in the case of network server
The licenses for most software and other practical works are
designed to take away your freedom to share and change the works.
By contrast, our General Public Licenses are 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.
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.
Developers that use our General Public Licenses protect your
rights with two steps: (1) assert copyright on the software, and
(2) offer you this License which gives you legal permission to
copy, distribute and/or modify the software.
A secondary benefit of defending all users' freedom is that
improvements made in alternate versions of the program, if they
receive widespread use, become available for other developers to
incorporate. Many developers of free software are heartened and
encouraged by the resulting cooperation. However, in the case of
software used on network servers, this result may fail to come
about. The GNU General Public License permits making a modified
version and letting the public access it on a server without ever
releasing its source code to the public.
The GNU Affero General Public License is designed specifically to
ensure that, in such cases, the modified source code becomes
available to the community. It requires the operator of a network
server to provide the source code of the modified version running
there to the users of that server. Therefore, public use of a
modified version, on a publicly accessible server, gives the public
access to the source code of the modified version.
An older license, called the Affero General Public License and
published by Affero, was designed to accomplish similar goals. This
is a different license, not a version of the Affero GPL, but Affero
has released a new version of the Affero GPL which permits
relicensing under this license.
The precise terms and conditions for copying, distribution and
modification follow.
0. Definitions.
"This License" refers to version 3 of the GNU Affero 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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To "modify" a work means to copy from or adapt all or part of the
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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
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available to the public, and in some countries other activities as
To "convey" a work means any kind of propagation that enables
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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
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that licensees may convey the work under this License, and how to
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The "Corresponding Source" for a work in object code form means
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The Corresponding Source need not include anything that users can
regenerate automatically from other parts of the Corresponding
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
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permission to run the unmodified Program. The output from running a
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You may make, run and propagate covered works that you do not
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You may convey verbatim copies of the Program's source code as
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You may convey a covered work in object code form under the
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customarily used for software interchange.
b) Convey the object code in, or embodied in, a physical
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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 durable physical medium customarily used for software
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c) Convey individual copies of the object code with a copy of
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If you convey an object code work under this section in, or with,
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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
a) Disclaiming warranty or limiting liability differently from
the terms of sections 15 and 16 of this License; or
b) 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
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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 may add to a covered work material governed
by the terms of that license 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
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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.
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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
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
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
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
13. Remote Network Interaction; Use with the GNU General Public
Notwithstanding any other provision of this License, if you
modify the Program, your modified version must prominently offer
all users interacting with it remotely through a computer network
(if your version supports such interaction) an opportunity to
receive the Corresponding Source of your version by providing
access to the Corresponding Source from a network server at no
charge, through some standard or customary means of facilitating
copying of software. This Corresponding Source shall include the
Corresponding Source for any work covered by version 3 of the GNU
General Public License that is incorporated pursuant to the
following paragraph.
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 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 work with which it is combined will remain governed
by version 3 of the GNU General Public License.
14. Revised Versions of this License.
The Free Software Foundation may publish revised and/or new
versions of the GNU Affero 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
Each version is given a distinguishing version number. If the
Program specifies that a certain numbered version of the GNU Affero
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 Affero 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 Affero 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.
16. Limitation of Liability.
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.
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 Affero General Public
License as published by the Free Software Foundation, either
version 3 of the License, or (at your option) any later
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General
Public License along with this program. If not, see
Also add information on how to contact you by electronic and paper
If your software can interact with users remotely through a
computer network, you should also make sure that it provides a way
for users to get its source. For example, if your program is a web
application, its interface could display a "Source" link that leads
users to an archive of the code. There are many ways you could
offer source, and different solutions will be better for different
programs; see section 13 for the specific requirements.
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 AGPL, see <>.