Copyright for coco-doc source package in Focal

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: coco-doc
Source: http://ssw.jku.at/Coco/

Files: *
Copyright: 1990, 2004, 2010 Hanspeter Moessenboeck, University of Linz
           2010 Markus Löberbauer 
           2010 Albrecht Wöß, University of Linz
License: GPL-2.0+ with CocoR exception

Files: debian/*
Copyright: 2004-2006 Markus Loeberbauer
License: GPL-2.0+ with CocoR exception

License: GPL-2.0+ with CocoR exception
 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 2, 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.
 .
 You should have received a copy of the GNU General Public License along 
 with this program; if not, write to the Free Software Foundation, Inc., 
 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA.
 .
 As an exception, it is allowed to write an extension of Coco/R that is
 used as a plugin in non-free software.
 .
 If not otherwise stated, any source code generated by Coco/R (other than 
 Coco/R itself) does not fall under the GNU General Public License.
 .
 On Debian systems, the full text of the GNU General Public
 License version 2 can be found in the file
 `/usr/share/common-licenses/GPL-2'.