Copyright for xl2tpd source package in Trusty

Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Source: http://www.xelerance.com/software/xl2tpd/ (repacked to remove non-free RFC text included in upstream distribution)

Files: *
Copyright: (c) 2006-2011 Xelerance Corporation
License: GPL-2+
 Please see the CREDITS file for a complete copyright history of all parts of
 the project.
 .
 On Debian systems, the complete text of the GNU General
 Public License can be found in `/usr/share/common-licenses/GPL-2'.

Files: debian/*
Copyright: (c) 2007-2013 Roberto C. Sanchez 
License: GPL-2+
 The packaging is based on the packaging of the original l2tpd package by
 Jean-Francois Dive.