.. _license:

===================
License information
===================

Most parts of ndnSIM code are licensed under GNU GPL License 3.0.

GNU GENERAL PUBLIC LICENSE
==========================

Version 3, 29 June 2007
=======================

    Copyright (C) 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 rights or asking you to
surrender the rights. Therefore, you have certain responsibilities if you distribute copies of the
software, or if you modify it: responsibilities to respect the freedom of others.

For example, if you distribute copies of such a program, whether gratis or for a fee, you must pass
on to the recipients the same freedoms that you received. You must make sure that they, too, receive
or can get the source code. And you must show them these terms so they know their rights.

Developers that use the GNU GPL protect your rights with two steps: (1) assert copyright on the
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For the developers' and authors' protection, the GPL clearly explains that there is no warranty for
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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 to do anything with it that, without permission, would make you
directly or secondarily liable for infringement under applicable copyright law, except executing it
on a computer or modifying a private copy. Propagation includes copying, distribution (with or
without modification), making available to the public, and in some countries other activities as
well.

To *"convey"* a work means any kind of propagation that enables other parties to make or receive
copies. Mere interaction with a user through a computer network, with no transfer of a copy, is not
conveying.

An interactive user interface displays "Appropriate Legal Notices" to the extent that it includes a
convenient and prominently visible feature that (1) displays an appropriate copyright notice, and
(2) tells the user that there is no warranty for the work (except to the extent that warranties are
provided), that licensees may convey the work under this License, and how to view a copy of this
License. If the interface presents a list of user commands or options, such as a menu, a prominent
item in the list meets this criterion.

1. Source Code.
---------------

The *"source code"* for a work means the preferred form of the work for making modifications to it.
*"Object code"* means any non-source form of a work.

A *"Standard Interface"* means an interface that either is an official standard defined by a
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for shared libraries and dynamically linked subprograms that the work is specifically designed to
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parts of the work.

The Corresponding Source need not include anything that users can regenerate automatically from
other parts of the Corresponding Source.

The Corresponding Source for a work in source code form is that same work.

2. Basic Permissions.
---------------------

All rights granted under this License are granted for the term of copyright on the Program, and are
irrevocable provided the stated conditions are met. This License explicitly affirms your unlimited
permission to run the unmodified Program. The output from running a covered work is covered by this
License only if the output, given its content, constitutes a covered work. This License acknowledges
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You may make, run and propagate covered works that you do not convey, without conditions so long as
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Conveying under any other circumstances is permitted solely under the conditions stated below.
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3. Protecting Users' Legal Rights From Anti-Circumvention Law.
--------------------------------------------------------------

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4. Conveying Verbatim Copies.
-----------------------------

You may convey verbatim copies of the Program's source code as you receive it, in any medium,
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You may charge any price or no price for each copy that you convey, and you may offer support or
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5. Conveying Modified Source Versions.
--------------------------------------

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
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    a) The work must carry prominent notices stating that you modified
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    b) The work must carry prominent notices stating that it is
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    c) You must license the entire work, as a whole, under this
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A compilation of a covered work with other separate and independent works, which are not by their
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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
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    copy of the Corresponding Source for all the software in the
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    d) Convey the object code by offering access from a designated
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as a System Library, need not be included in conveying the object code work.

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
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If you convey an object code work under this section in, or with, or specifically for use in, a User
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The requirement to provide Installation Information does not include a requirement to continue to
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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:

    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

    c) 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

    d) Limiting the use for publicity purposes of names of licensors or
    authors of the material; or

    e) Declining to grant rights under trademark law for use of some
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    f) 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.

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 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.