Copyright for xringd source package in Focal

This is Angelo Haritsis'  Extended Ring Daemon
prepackaged for Debian.

This package was put together by David Engel , from
sources obtained from:
 sunsite.unc.edu:/pub/Linux/system/network/daemons/xringd-1.20.tgz

xringd is distributed under the GNU General Public License.

xringd is Copyright (c) 1995-1996 Angelo Haritsis. All rights reserved.

    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.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software Foundation,
    Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.

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