Copyright for ball source package in Focal

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: BALL
Upstream-Contact: Andreas Hildebrandt 
Source: https://github.com/BALL-Project/ball

Files: *
Copyright: © 1998-2013 the BALL project group
                       Andreas Hildebrandt ,
                       Oliver Kohlbacher ,
                       Andreas Moll 
                       .
           Further contributors as listed on http://www.ballview.org/Overview/Team :
           .
           Tim Aubertin, Christian Bender, Andreas Bertsch, Nicolas Pascal
           Boghossian, Andreas Burchardt, Andreas Crauser, Anna Dehof, Carla
           Haid, Andreas Kerzmann, Heiko Klein, Hans-Peter Lenhof, Bettina
           Leonhardt, Peter Müller, Stefan Strobel, Marc Sturm
License: GPL-2+

Files: debian/*
Copyright: 2007 Andreas Moll 
           2008-2011 Andreas Hildebrandt 
                     Steffen Moeller 
License: GPL-2+

License: GPL-2+
    This package is free software; you can redistribute it and/or
    modify it either under the terms of the GNU Lesser General Public
    License (libraries) or the GNU General Public License (the ballview
    application) as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.
    The respective source code will indicate which license is applying
    for the code of your interest. If in doubt, contact the authors.
 .
    This package 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
    Lesser General Public License for more details.
 .
    You should have received a copy of the GNU Lesser General Public
    License along with this package; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 .
 On Debian systems, the complete text of the GNU General Public License
 version 2 can be found in `/usr/share/common-licenses/GPL-2'.