Copyright for sn source package in Focal

This package was debianized by Jorgen Schaefer  on
Tue, 29 Feb 2000 10:11:31 +0100.

It was downloaded from http://www.iki.fi/patrik/sn/files/

Upstream Authors: Patrik Rådman 
                  Harold Tay 

Copyright:
This software is copyright (c) 1998-99 by Harold Tay.
                           (c) 2000 Patrik Rådman

You are free to distribute this software under the terms of
the GNU General Public License.

On Debian systems, the complete text of the GNU General Public
License can be found in /usr/share/common-licenses/GPL file.