Copyright for epstool source package in Focal

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: epstool
Upstream-Contact: Russell Lang 
Source: http://www.ghostgum.com.au/software/epstool.htm

Files: *
Copyright: 1993-2005, Ghostgum Software Pty Ltd.
License: GPL-2+

Files: src/errors.h
Copyright: 1989, 1995, 1998-1999, Aladdin Enterprises.
License: GPL-2+

Files: debian/*
Copyright: 2003-2009, Martin Pitt 
           2009-2014, Philip Rinn 
License: GPL-2+

License: GPL-2+
 On Debian GNU/Linux systems, the complete text of the GNU General Public
 License version 2 can be found in `/usr/share/common-licenses/GPL-2'.