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CVC4 is copyright (C) 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017 by
its authors and contributors (see the file AUTHORS) and their institutional
affiliations. All rights reserved.
The source code of CVC4 is open and available to students, researchers,
software companies, and everyone else to study, to modify, and to redistribute
original or modified versions; distribution is under the terms of the modified
BSD license (reproduced below). Please note that CVC4 can be configured
(however, by default it is not) to link against some GPLed libraries, and
therefore the use of these builds may be restricted in non-GPL-compatible
projects. See below for a discussion of CLN, GLPK, and Readline (the three
GPLed optional library dependences for CVC4), and how to ensure you have a
build that doesn't link against GPLed libraries.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. Neither the name of the copyright holder nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT OWNERS AND CONTRIBUTORS
''AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-------------------------------------------------------------------------------
Third-Party Software
-------------------------------------------------------------------------------
The CVC4 source code includes third-party software which has its own copyright
and licensing terms, as described below.
Each of the following files contains third-party software.
autogen.sh
config/ax_cxx_compile_stdcxx.m4
config/ax_cxx_compile_stdcxx_11.m4
config/ax_prog_doxygen.m4
config/boost.m4
config/doxygen.am
config/pkg.m4
The copyright and licensing information for each of these files is in the
header of the corresponding file.
CVC4 incorporates MiniSat code (see src/prop/minisat and src/prop/bvminisat),
excluded from the above copyright. See src/prop/minisat/LICENSE and
src/prop/bvminisat/LICENSE for copyright and licensing information.
CVC4 incorporates some code from Boost (see src/util/channel.h), excluded from
the above copyright. See licenses/channel.h-LICENSE for copyright and
licensing information.
CVC4 incorporates code from ANTLR3 (http://www.antlr3.org/), the files
src/parser/bounded_token_buffer.h, src/parser/bounded_token_buffer.cpp, and
src/parser/antlr_input_imports.cpp are excluded from the above copyright.
See licenses/antlr3-LICENSE for copyright and licensing information.
CVC4 by default links against The GNU Multiple Precision (GMP) Arithmetic
Library, which is licensed under GNU LGPL v3. See the file
licenses/lgpl-3.0.txt for a copy of that license. Note that according to the
terms of the LGPL, both CVC4's source, and the combined work (CVC4 linked with
GMP) may (and do) remain under the more permissive modified BSD license.
CVC4 optionally links against the following libraries:
ABC (https://bitbucket.org/alanmi/abc)
CaDiCaL (https://github.com/arminbiere/cadical)
CryptoMiniSat (https://github.com/msoos/cryptominisat)
LFSC checker (https://github.com/CVC4/LFSC)
Linking CVC4 against these libraries does not affect the license terms of the
CVC4 code. See the respective projects for copyright and licensing
information.
-------------------------------------------------------------------------------
OPTIONAL GPLv3 libraries
-------------------------------------------------------------------------------
Please be advised that the following libraries are covered under the GPLv3
license. If you choose to link CVC4 against one of these libraries, the
resulting combined work is also covered under the GPLv3. If you want to make
sure you build a version of CVC4 that uses no GPLed libraries, configure CVC4
with the "--bsd" option before building (which is the default). CVC4 can then
be used in contexts where you want to use CVC4 under the terms of the
(modified) BSD license. See licenses/gpl-3.0.txt for more information.
CVC4 can be optionally configured to link against CLN, the Class Library for
Numbers, available here:
http://www.ginac.de/CLN/
CVC4 can be optionally configured to link against glpk-cut-log, a modified
version of GLPK, the GNU Linear Programming Kit, available here:
https://github.com/timothy-king/glpk-cut-log
CVC4 can be optionally configured to link against GNU Readline for improved
text-editing support in interactive mode. GNU Readline is available here:
http://cnswww.cns.cwru.edu/php/chet/readline/rltop.html
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