COPYING

   1 CVC4 is copyright (C) 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017 by
   2 its authors and contributors (see the file AUTHORS) and their institutional
   3 affiliations.  All rights reserved.
   4
   5 The source code of CVC4 is open and available to students, researchers,
   6 software companies, and everyone else to study, to modify, and to redistribute
   7 original or modified versions; distribution is under the terms of the modified
   8 BSD license (reproduced below).  Please note that CVC4 can be configured
   9 (however, by default it is not) to link against some GPLed libraries, and
  10 therefore the use of these builds may be restricted in non-GPL-compatible
  11 projects.  See below for a discussion of CLN, GLPK, and Readline (the three
  12 GPLed optional library dependences for CVC4), and how to ensure you have a
  13 build that doesn't link against GPLed libraries.
  14
  15 Redistribution and use in source and binary forms, with or without
  16 modification, are permitted provided that the following conditions are
  17 met:
  18
  19 1. Redistributions of source code must retain the above copyright
  20    notice, this list of conditions and the following disclaimer.
  21
  22 2. Redistributions in binary form must reproduce the above copyright
  23    notice, this list of conditions and the following disclaimer in the
  24    documentation and/or other materials provided with the distribution.
  25
  26 3. Neither the name of the copyright holder nor the names of its
  27    contributors may be used to endorse or promote products derived from
  28    this software without specific prior written permission.
  29
  30 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT OWNERS AND CONTRIBUTORS
  31 ''AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  32 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  33 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  34 OWNERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  35 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  36 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  37 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  38 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  39 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  40 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  41
  42
  43 -------------------------------------------------------------------------------
  44  Third-Party Software
  45 -------------------------------------------------------------------------------
  46
  47 The CVC4 source code includes third-party software which has its own copyright
  48 and licensing terms, as described below.
  49
  50 Each of the following files contains third-party software.
  51
  52   autogen.sh
  53   config/ax_cxx_compile_stdcxx.m4
  54   config/ax_cxx_compile_stdcxx_11.m4
  55   config/ax_prog_doxygen.m4
  56   config/boost.m4
  57   config/doxygen.am
  58   config/pkg.m4
  59
  60 The copyright and licensing information for each of these files is in the
  61 header of the corresponding file.
  62
  63 CVC4 incorporates MiniSat code (see src/prop/minisat and src/prop/bvminisat),
  64 excluded from the above copyright.  See src/prop/minisat/LICENSE and
  65 src/prop/bvminisat/LICENSE for copyright and licensing information.
  66
  67 CVC4 incorporates some code from Boost (see src/util/channel.h), excluded from
  68 the above copyright.  See licenses/channel.h-LICENSE for copyright and
  69 licensing information.
  70
  71 CVC4 incorporates code from ANTLR3 (http://www.antlr3.org/), the files
  72 src/parser/bounded_token_buffer.h, src/parser/bounded_token_buffer.cpp, and
  73 src/parser/antlr_input_imports.cpp are excluded from the above copyright.
  74 See licenses/antlr3-LICENSE for copyright and licensing information.
  75
  76 CVC4 by default links against The GNU Multiple Precision (GMP) Arithmetic
  77 Library, which is licensed under GNU LGPL v3. See the file
  78 licenses/lgpl-3.0.txt for a copy of that license.  Note that according to the
  79 terms of the LGPL, both CVC4's source, and the combined work (CVC4 linked with
  80 GMP) may (and do) remain under the more permissive modified BSD license.
  81
  82 CVC4 optionally links against the following libraries:
  83
  84   ABC                (https://bitbucket.org/alanmi/abc)
  85   Cryptominisat4.0   (https://github.com/msoos/cryptominisat)
  86   LFSC checker       (https://github.com/CVC4/LFSC)
  87
  88 Linking CVC4 against these libraries does not affect the license terms of the
  89 CVC4 code.  See the respective projects for copyright and licensing
  90 information.
  91
  92
  93 -------------------------------------------------------------------------------
  94  OPTIONAL GPLv3 libraries
  95 -------------------------------------------------------------------------------
  96
  97 Please be advised that the following libraries are covered under the GPLv3
  98 license.  If you choose to link CVC4 against one of these libraries, the
  99 resulting combined work is also covered under the GPLv3. If you want to make
 100 sure you build a version of CVC4 that uses no GPLed libraries, configure CVC4
 101 with the "--bsd" option before building (which is the default).  CVC4 can then
 102 be used in contexts where you want to use CVC4 under the terms of the
 103 (modified) BSD license.  See licenses/gpl-3.0.txt for more information.
 104
 105 CVC4 can be optionally configured to link against CLN, the Class Library for
 106 Numbers, available here:
 107
 108   http://www.ginac.de/CLN/
 109
 110 CVC4 can be optionally configured to link against glpk-cut-log, a modified
 111 version of GLPK, the GNU Linear Programming Kit, available here:
 112
 113   https://github.com/timothy-king/glpk-cut-log
 114
 115 CVC4 can be optionally configured to link against GNU Readline for improved
 116 text-editing support in interactive mode.  GNU Readline is available here:
 117
 118   http://cnswww.cns.cwru.edu/php/chet/readline/rltop.html
 119