Copyright for lbt source package in Focal

Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: LBT 
Source: http://www.tcs.hut.fi/Software/maria/src/
Upstream-Contact:  Marko Mäkelä 
                   Mauno Rönkkö 
		   Heikki Tauriainen 

Files: *
Copyright: Copyright (c) 1998 Mauno Rönkkö 
License: GPL-2+

Files: debian/*
Copyright: Copyright (c) 2002-2016 Ralf Treinen 
License: GPL-2+

License: GPL-2+
 This product contains 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 2 of the
 License, or (at your option) any later version. These terms also
 apply to any hardware schemas and any other information presented in
 the www-pages below.
 .
 On Debian systems, the complete text of the GNU General Public
 License can be found in the /usr/share/common-licenses/GPL-2 file.