Copyright for libpri source package in Mantic

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: libpri
Source: https://downloads.asterisk.org/pub/telephony/libpri/

Files: *
Copyright: 2001-2010, Digium, Inc.
License: GPL-2

Files: debian/*
Copyright:
 2005-2007, Kilian Kraus 
 2005-2013, Mark Purcell 
 2005-2018, Tzafrir Cohen 
 2007-2011, Faidon Liambotis 
 2014, Jeremy Lainé 
License: GPL-2

License: GPL-2
 This program is free software, distributed under the terms of
 the GNU General Public License Version 2 as published by the
 Free Software Foundation. See the LICENSE file included with
 this program for more details.
 .
 In addition, when this program is distributed with Asterisk in
 any form that would qualify as a 'combined work' or as a
 'derivative work' (but not mere aggregation), you can redistribute
 and/or modify the combination under the terms of the license
 provided with that copy of Asterisk, instead of the license
 terms granted here.
 .
 On a Debian system you can find a copy of the GNU General Public
 License Version 2 at /usr/share/common-licenses/GPL-2 .