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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>Appendix D.  GNU General Public License version 3</title><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><meta name="keywords" content="ISO C++, runtime, library" /><link rel="home" href="../index.html" title="The GNU C++ Library" /><link rel="up" href="appendix.html" title="Part IV.  Appendices" /><link rel="prev" href="appendix_free.html" title="Appendix C.  Free Software Needs Free Documentation" /><link rel="next" href="appendix_gfdl.html" title="Appendix E. GNU Free Documentation License" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Appendix D. 
<acronym class="acronym">GNU</acronym> General Public License version 3
</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="appendix_free.html">Prev</a> </td><th width="60%" align="center">Part IV. 
Appendices
</th><td width="20%" align="right"> <a accesskey="n" href="appendix_gfdl.html">Next</a></td></tr></table><hr /></div><div class="appendix"><div class="titlepage"><div><div><h1 class="title"><a id="appendix.gpl-3.0"></a>
<acronym class="acronym">GNU</acronym> General Public License version 3
</h1></div></div></div><p>
Version 3, 29 June 2007
</p><p>
Copyright © 2007 Free Software Foundation, Inc.
<a class="link" href="https://www.fsf.org" target="_top">https://www.fsf.org</a>
</p><p>
Everyone is permitted to copy and distribute verbatim copies of this license
document, but changing it is not allowed.
</p><h2><a id="gpl-3-preamble"></a>
Preamble
</h2><p>
The <acronym class="acronym">GNU</acronym> General Public License is a free, copyleft
license for software and other kinds of works.
</p><p>
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
<acronym class="acronym">GNU</acronym> 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 <acronym class="acronym">GNU</acronym> 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.
</p><p>
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.
</p><p>
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.
</p><p>
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.
</p><p>
Developers that use the <acronym class="acronym">GNU</acronym> <acronym class="acronym">GPL</acronym>
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.
</p><p>
For the developers’ and authors’ protection, the
<acronym class="acronym">GPL</acronym> clearly explains that there is no warranty for this
free software. For both users’ and authors’ sake, the
<acronym class="acronym">GPL</acronym> requires that modified versions be marked as changed,
so that their problems will not be attributed erroneously to authors of
previous versions.
</p><p>
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
<acronym class="acronym">GPL</acronym> 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 <acronym class="acronym">GPL</acronym>,
as needed to protect the freedom of users.
</p><p>
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 <acronym class="acronym">GPL</acronym>
assures that patents cannot be used to render the program non-free.
</p><p>
The precise terms and conditions for copying, distribution and modification
follow.
</p><h2><a id="id-1.3.6.5.16"></a>
TERMS AND CONDITIONS
</h2><h2><a id="gpl-3-definitions"></a>
0. Definitions.
</h2><p>
“This License” refers to version 3 of the <acronym class="acronym">GNU</acronym>
General Public License.
</p><p>
“Copyright” also means copyright-like laws that apply to other
kinds of works, such as semiconductor masks.
</p><p>
“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.
</p><p>
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.
</p><p>
A “covered work” means either the unmodified Program or a work
based on the Program.
</p><p>
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.
</p><p>
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.
</p><p>
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.
</p><h2><a id="SourceCode"></a>
1. Source Code.
</h2><p>
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.
</p><p>
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.
</p><p>
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.
</p><p>
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.
</p><p>
The Corresponding Source need not include anything that users can regenerate
automatically from other parts of the Corresponding Source.
</p><p>
The Corresponding Source for a work in source code form is that same work.
</p><h2><a id="BasicPermissions"></a>
2. Basic Permissions.
</h2><p>
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.
</p><p>
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.
</p><p>
Conveying under any other circumstances is permitted solely under the
conditions stated below. Sublicensing is not allowed; section 10 makes it
unnecessary.
</p><h2><a id="Protecting"></a>
3. Protecting Users’ Legal Rights From Anti-Circumvention Law.
</h2><p>
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.
</p><p>
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, against the work’s users, your or
third parties’ legal rights to forbid circumvention of technological
measures.
</p><h2><a id="ConveyingVerbatim"></a>
4. Conveying Verbatim Copies.
</h2><p>
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.
</p><p>
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.
</p><h2><a id="ConveyingModified"></a>
5. Conveying Modified Source Versions.
</h2><p>
You may convey a work based on the Program, or the modifications to produce
it from the Program, in the form of source code under the terms of section
4, provided that you also meet all of these conditions:
</p><div class="orderedlist"><ol class="orderedlist" type="a"><li class="listitem"><p>
The work must carry prominent notices stating that you modified it, and
giving a relevant date.
</p></li><li class="listitem"><p>
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”.
</p></li><li class="listitem"><p>
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 have
separately received it.
</p></li><li class="listitem"><p>
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.
</p></li></ol></div><p>
A compilation of a covered work with other separate and independent works,
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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.
</p><h2><a id="ConveyingNonSource"></a>
6. Conveying Non-Source Forms.
</h2><p>
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
Corresponding Source under the terms of this License, in one of these ways:
</p><div class="orderedlist"><ol class="orderedlist" type="a"><li class="listitem"><p>
Convey the object code in, or embodied in, a physical product (including
a physical distribution medium), accompanied by the Corresponding Source
fixed on a durable physical medium customarily used for software
interchange.
</p></li><li class="listitem"><p>
Convey the object code in, or embodied in, a physical product (including
a physical distribution medium), accompanied by a written offer, valid
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
durable physical medium customarily used for software interchange, for a
price no more than your reasonable cost of physically performing this
conveying of source, or (2) access to copy the Corresponding Source from
a network server at no charge.
</p></li><li class="listitem"><p>
Convey individual copies of the object code with a copy of the written
offer to provide the Corresponding Source. This alternative is allowed
only occasionally and noncommercially, and only if you received the
object code with such an offer, in accord with subsection 6b.
</p></li><li class="listitem"><p>
Convey the object code by offering access from a designated place
(gratis or for a charge), and offer equivalent access to the
Corresponding Source in the same way through the same place at no
further charge. You need not require recipients to copy the
Corresponding Source along with the object code. If the place to copy
the object code is a network server, the Corresponding Source may be on
a different server (operated by you or a third party) that supports
equivalent copying facilities, provided you maintain clear directions
next to the object code saying where to find the Corresponding Source.
Regardless of what server hosts the Corresponding Source, you remain
obligated to ensure that it is available for as long as needed to
satisfy these requirements.
</p></li><li class="listitem"><p>
Convey the object code using peer-to-peer transmission, provided you
inform other peers where the object code and Corresponding Source of the
work are being offered to the general public at no charge under
subsection 6d.
</p></li></ol></div><p>
A separable portion of the object code, whose source code is excluded from
the Corresponding Source as a System Library, need not be included in
conveying the object code work.
</p><p>
A “User Product” is either (1) a “consumer product”,
which means any tangible personal property which is normally used for
personal, family, or household purposes, or (2) anything designed or sold
for incorporation into a dwelling. In determining whether a product is a
consumer product, doubtful cases shall be resolved in favor of coverage.
For a particular product received by a particular user, “normally
used” refers to a typical or common use of that class of product,
regardless of the status of the particular user or of the way in which the
particular user actually uses, or expects or is expected to use, the
product. A product is a consumer product regardless of whether the product
has substantial commercial, industrial or non-consumer uses, unless such
uses represent the only significant mode of use of the product.
</p><p>
“Installation Information” for a User Product means any methods,
procedures, authorization keys, or other information required to install and
execute modified versions of a covered work in that User Product from a
modified version of its Corresponding Source. The information must suffice
to ensure that the continued functioning of the modified object code is in
no case prevented or interfered with solely because modification has been
made.
</p><p>
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
a transaction in which the right of possession and use of the User Product
is transferred to the recipient in perpetuity or for a fixed term
(regardless of how the transaction is characterized), the Corresponding
Source conveyed under this section must be accompanied by the Installation
Information. But this requirement does not apply if neither you nor any
third party retains the ability to install modified object code on the User
Product (for example, the work has been installed in
<acronym class="acronym">ROM</acronym>).
</p><p>
The requirement to provide Installation Information does not include a
requirement to continue to provide support service, warranty, or updates for
a work that has been modified or installed by the recipient, or for the User
Product in which it has been modified or installed. Access to a network may
be denied when the modification itself materially and adversely affects the
operation of the network or violates the rules and protocols for
communication across the network.
</p><p>
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.
</p><h2><a id="AdditionalTerms"></a>
7. Additional Terms.
</h2><p>
“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.
</p><p>
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.
</p><p>
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:
</p><div class="orderedlist"><ol class="orderedlist" type="a"><li class="listitem"><p>
Disclaiming warranty or limiting liability differently from the terms
of sections 15 and 16 of this License; or
</p></li><li class="listitem"><p>
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
</p></li><li class="listitem"><p>
Prohibiting misrepresentation of the origin of that material, or
requiring that modified versions of such material be marked in
reasonable ways as different from the original version; or
</p></li><li class="listitem"><p>
Limiting the use for publicity purposes of names of licensors or
authors of the material; or
</p></li><li class="listitem"><p>
Declining to grant rights under trademark law for use of some trade
names, trademarks, or service marks; or
</p></li><li class="listitem"><p>
Requiring indemnification of licensors and authors of that material by
anyone who conveys the material (or modified versions of it) with
contractual assumptions of liability to the recipient, for any
liability that these contractual assumptions directly impose on those
licensors and authors.
</p></li></ol></div><p>
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.
</p><p>
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.
</p><p>
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.
</p><h2><a id="gpl-3-termination"></a>
8. Termination.
</h2><p>
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).
</p><p>
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.
</p><p>
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.
</p><p>
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.
</p><h2><a id="AcceptanceNotRequired"></a>
9. Acceptance Not Required for Having Copies.
</h2><p>
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.
</p><h2><a id="AutomaticDownstream"></a>
10. Automatic Licensing of Downstream Recipients.
</h2><p>
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.
</p><p>
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
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it with reasonable efforts.
</p><p>
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.
</p><h2><a id="Patents"></a>
11. Patents.
</h2><p>
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”.
</p><p>
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.
</p><p>
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.
</p><p>
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.
</p><p>
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.
</p><p>
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.
</p><p>
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.
</p><p>
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.
</p><h2><a id="NoSurrender"></a>
12. No Surrender of Others’ Freedom.
</h2><p>
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.
</p><h2><a id="UsedWithAGPL"></a>
13. Use with the <acronym class="acronym">GNU</acronym> Affero General Public License.
</h2><p>
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
<acronym class="acronym">GNU</acronym> 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 <acronym class="acronym">GNU</acronym> Affero General Public License,
section 13, concerning interaction through a network will apply to the
combination as such.
</p><h2><a id="RevisedVersions"></a>
14. Revised Versions of this License.
</h2><p>
The Free Software Foundation may publish revised and/or new versions of the
<acronym class="acronym">GNU</acronym> 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.
</p><p>
Each version is given a distinguishing version number. If the Program
specifies that a certain numbered version of the <acronym class="acronym">GNU</acronym>
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
<acronym class="acronym">GNU</acronym> General Public License, you may choose any version
ever published by the Free Software Foundation.
</p><p>
If the Program specifies that a proxy can decide which future versions of
the <acronym class="acronym">GNU</acronym> 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.
</p><p>
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.
</p><h2><a id="WarrantyDisclaimer"></a>
15. Disclaimer of Warranty.
</h2><p>
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.
</p><h2><a id="LiabilityLimitation"></a>
16. Limitation of Liability.
</h2><p>
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.
</p><h2><a id="InterpretationSecs1516"></a>
17. Interpretation of Sections 15 and 16.
</h2><p>
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.
</p><h2><a id="id-1.3.6.5.99"></a>
END OF TERMS AND CONDITIONS
</h2><h2><a id="HowToApply"></a>
How to Apply These Terms to Your New Programs
</h2><p>
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.
</p><p>
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.
</p><pre class="screen">
<em class="replaceable"><code>one line to give the program’s name and a brief idea of what it does.</code></em>
Copyright (C) <em class="replaceable"><code>year</code></em> <em class="replaceable"><code>name of author</code></em>
This program is free software: you can redistribute it and/or modify
it under the terms of the <acronym class="acronym">GNU</acronym> 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
<acronym class="acronym">GNU</acronym> General Public License for more details.
You should have received a copy of the <acronym class="acronym">GNU</acronym> General Public License
along with this program. If not, see <a class="link" href="http://www.gnu.org/licenses/" target="_top">http://www.gnu.org/licenses/</a>.
</pre><p>
Also add information on how to contact you by electronic and paper mail.
</p><p>
If the program does terminal interaction, make it output a short notice like
this when it starts in an interactive mode:
</p><pre class="screen">
<em class="replaceable"><code>program</code></em> Copyright (C) <em class="replaceable"><code>year</code></em> <em class="replaceable"><code>name of author</code></em>
This program comes with ABSOLUTELY NO WARRANTY; for details type ‘<code class="literal">show w</code>’.
This is free software, and you are welcome to redistribute it
under certain conditions; type ‘<code class="literal">show c</code>’ for details.
</pre><p>
The hypothetical commands ‘<code class="literal">show w</code>’ and
‘<code class="literal">show c</code>’ 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”.
</p><p>
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
<acronym class="acronym">GNU</acronym> <acronym class="acronym">GPL</acronym>, see
<a class="link" href="http://www.gnu.org/licenses/" target="_top">http://www.gnu.org/licenses/</a>.
</p><p>
The <acronym class="acronym">GNU</acronym> 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 <acronym class="acronym">GNU</acronym> Lesser General Public License instead of this
License. But first, please read <a class="link" href="https://www.gnu.org/licenses/why-not-lgpl.html" target="_top">https://www.gnu.org/licenses/why-not-lgpl.html</a>.
</p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="appendix_free.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="appendix.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="appendix_gfdl.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Appendix C. 
Free Software Needs Free Documentation
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