secnet - flexible VPN software ============================== secnet is Copyright 1995-2003 Stephen Early Copyright 2002-2014 Ian Jackson Copyright 1991 Massachusetts Institute of Technology Copyright 1998 Ross Anderson, Eli Biham, Lars Knudsen Copyright 1993 Colin Plumb Copyright 1998 James H. Brown, Steve Reid Copyright 2000 Vincent Rijmen, Antoon Bosselaers, Paulo Barreto Copyright 2001 Joey Hess Copyright 2000-2006 Joachim Henkea Copyright 2012-2016 Adrien Béraud Copyright 2015 Guillaume Jacquenot Copyright 2016 SunDwarf aka eyesismine Copyright 2001 Saul Kravitz Copyright 2004 Fabrice Bellard Copyright 2002 Guido Draheim Copyright 2005-2010 Free Software Foundation, Inc. Copyright 1995-2001 Jonathan Amery Copyright 1995-2003 Peter Benie Copyright 2011 Richard Kettlewell Copyright 2012 Matthew Vernon Copyright 2013-2019 Mark Wooding Copyright 1995-2013 Simon Tatham GPLv3+ ====== secnet is distributed under the terms of the GNU General Public License, version 3 or later. secnet 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. The file COPYING in the source tree contains a copy of the GNU GPL v3. A copy of this licence can be found on Debian systems (and derivatives) in /usr/share/common-licenses/GPL-3. Some files contain a notice with the abbreviated form: SPDX-License-Identifier: GPL-3.0-or-later As is conventional, this should be read as a licence grant. Incorporated works ================== Some of the source code has more liberal licences, all of which are GPLv3+-compatible. See the individual source files (or directories) for details. These portions can be used, distributed, and modified, separately, under the more liberal licence. But when they are used or distributed as part of secnet, the GPL applies to the combination. Contributing ============ Contributions to secnet are accepted based on the git commit Signed-off-by convention, by which the contributors' certify their contributions according to the Developer Certificate of Origin version 1.1 - see the file DEVELOPER-CERTIFICATE. In accordance with the Developer Certificate of Origin, if you make a contribution to one of the incorporated works with a more liberal licence, you will be taken to have made your contribution under that more liberal licence. If you create a new file please be sure to add an appropriate licence header. In the main parts of secnet this should be something like: * This file is part of secnet. * See LICENCE and CREDITS for full list of copyright holders. * SPDX-License-Identifier: GPL-3.0-or-later * There is NO WARRANTY.