This is secnet packages for Debian GNU/Linux systems and derivatives.

secnet is
  Copyright 1995-2003 Stephen Early <steve@greenend.org.uk>
  Copyright 2002-2014 Ian Jackson <ijackson@chiark.greenend.org.uk>
  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      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      Mark Wooding
  Copyright 1995-2013 Simon Tatham
  Copyright 2012,2013 "Omnifarious" and "btel" on Stackoverflow

The Debian package, additionally, is:
  Copyright 2001      Joey Hess

secnet is distributed under the terms of the GNU General Public
License, version 3 or later.  A copy of this licence can be found on
your Debian system in /usr/share/common-licenses/GPL-3.

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.