Copyright for alsa-plugins source package in Focal

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: alsa-plugins
Upstream-Contact: Jarsolav Kysela 
Source: ftp://ftp.alsa-project.org/pub/plugins
Comment:
 This package was debianized by Thomas Hood on 25 March 2005.
 .
 Since September 2002 it has been maintained by the participants in
 the pkg-alsa project at alioth.debian.org.

Files: *
Copyright: 1998-2018 Jarsolav Kysela  and others
License: LGPL-2.1+

Files: debian/*
Copyright: 1998-1999 Wichert Akkerman
           1999-2002 Masato Taruishi
           2002-2017 Debian ALSA Maintainers
License: LGPL-2.1+

License: LGPL-2.1+
 This library is free software; you can redistribute it and/or modify
 it under the terms of the GNU Lesser General Public License as
 published by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
 .
 You should have received a copy of the GNU Lesser General Public
 License along with this library; if not, write to the Free Software
 Foundation, Inc., Foundation, Inc., 51 Franklin Street, Fifth Floor,
 Boston, MA  02110-1301  USA
 .
 On Debian systems, the complete text of the GNU Lesser General Public License
 can be found in /usr/share/common-licenses/LGPL-2.1.