Copyright for slang2 source package in Focal

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: S-Lang
Upstream-Contact: John E. Davis 
Source: ftp://space.mit.edu/pub/davis/slang
Comment:
 This package was debianized by Jim Mintha 
 on Mon, 16 Aug 1999 21:59:03 +0200.

Files: *
Copyright: 1995-2011 John E. Davis 
License: GPL-2+

Files: debian/*
Copyright: 2003-2012 Alastair McKinstry 
           2012      Dmitry Smirnov 
           2003      Petter Reinholdtsen 
           2003      Martin Sjogren 
           2002      Junichi Uekawa 
           1999      Ben Collins 
           1997-2003 Jim Mintha 
           1997-1998 Ray Dassen 
           1995-1996 Chris Fearnley
License: GPL-2+

License: GPL-2+
 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 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.
 .
 The complete text of the GNU General Public License version 2
 can be found in '/usr/share/common-licenses/GPL-2'.