Copyright for screen source package in Focal

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: GNU Screen
Upstream-Contact: screen-devel@gnu.org
Source: https://savannah.gnu.org/projects/screen
        https://ftp.gnu.org/gnu/screen/

Files: *
Copyright: 1987      Oliver Laumann
           1991      Wayne Davidson
           1993-2006 Juergen Weigert 
           1993-2006 Michael Schroeder 
License: GPL-3+

Files: debian/*
Copyright: 1996      Ian Murdock 
           1997      joost witteveen 
           1997-2001 Juan Cespedes 
           2001-2003 Adam Lazur 
           2007-2009 Jan Christoph Nordholz 
           2011      Brian Kroth 
           2011-2015 Axel Beckert 
License: GPL-3+
Comment: It is assumed that the Debian packaging is licensed under the
 same terms as the upstream project unless stated otherwise.

License: GPL-3+
 This program is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation; either version 3 of the License, or (at
 your option) any later version.
 .
 This program 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.
 .
 On Debian systems, the complete text of the GNU General Public
 License, version 3 can be found in "/usr/share/common-licenses/GPL-3".