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The source files in NS contain a number of different copyrights and
software licenses from various individuals and institutions. In 2005,
the code base was relicensed to a collection of GNU GPL compatible,
free software licenses. See
for a collection of definitions of these terms.
Note: See also the COPYRIGHTS file in this directory regarding the
copyrights on the ns-2 software.
The majority of software licenses use following types of licenses:
i) GNU GPL, with specific exception allowing the linking of the GPL
covered software with other software licensed with clauses in conflict with
the GPL (see below)
ii) original Berkeley-style licenses with advertising clauses
iii) modified Berkeley-style licenses (w/o advertising clause)
Other software licenses (e.g., Apache 2.0) also exist.
If you are considering the contribution of code to ns-2, please pick
a GNU GPL-compatible software license. If you prefer GNU GPL, please
add the specific exception text listed below.
If you are considering the use of ns-2, consider that derivative
works or redistribution may be governed by the terms of the software
licenses used herein, including the GNU GPL and Berkeley-style
licenses with advertising clauses.
GNU GPL license with specific exception (for use on ns-2 project):
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License,
version 2, as published by the Free Software Foundation.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
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, write to the Free Software Foundation, Inc.,
59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
The copyright of this module includes the following
linking-with-specific-other-licenses addition:
In addition, as a special exception, the copyright holders of
this module give you permission to combine (via static or
dynamic linking) this module with free software programs or
libraries that are released under the GNU LGPL and with code
included in the standard release of ns-2 under the Apache 2.0
license or under otherwise-compatible licenses with advertising
requirements (or modified versions of such code, with unchanged
license). You may copy and distribute such a system following the
terms of the GNU GPL for this module and the licenses of the
other code concerned, provided that you include the source code of
that other code when and as the GNU GPL requires distribution of
source code.
Note that people who make modified versions of this module
are not obligated to grant this special exception for their
modified versions; it is their choice whether to do so. The GNU
General Public License gives permission to release a modified
version without this exception; this exception also makes it
possible to release a modified version which carries forward this
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