Copyright for gnome-keysign source package in Mantic

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: GNOME Keysign
Upstream-Contact: Tobias Mueller 
Source: https://github.com/gnome-keysign/gnome-keysign

Files: *
Copyright: © 2014-2017 Tobias Mueller 
           © 2014 Andrei Macavei 
           © 2014 Srdjan Grubor 
           © 2015 Benjamin Berg 
           © 2015 Jody Hansen 
License: GPL-3+

Files: debian/*
Copyright: © 2017-2022 Sascha Steinbiss 
License: GPL-3+

Files: data/org.gnome.Keysign.raw.appdata.xml
Copyright: © 2014-2017 Tobias Mueller 
           © 2014 Andrei Macavei 
           © 2014 Srdjan Grubor 
           © 2015 Benjamin Berg 
           © 2015 Jody Hansen 
License: CC0

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.
 .
 You should have received a copy of the GNU General Public License
 along with this program.  If not, see .
 .
 On Debian Systems you can find a copy of the text of GPL version 3
 at /usr/share/common-licenses/GPL-3.

License: CC0
 On Debian systems, the complete text of the Creative Commons CC0 1.0
 Universal license (CC0-1.0) can be found in
 "/usr/share/common-licenses/CC0-1.0".