Copyright for rinetd source package in Focal

This package was debianized by Gergely Madarasz gorgo@caesar.elte.hu on
Sun, 07 Dec 1997 01:14:33 +0100.

It was downloaded from
https://github.com/samhocevar/rinetd/releases

Copyright (c) 1997, Thomas Boutell and Boutell.Com, Inc.  This software
is released for free use under the terms of the GNU Public License, version
2 or higher.

On Debian systems see /usr/share/common-licenses/GPL-2