Copyright for greylistd source package in Bionic

This program was created by Tor Slettnes  on May 18, 2004,
originally for Debian GNU/Linux.

"greylistd" is Copyright (C) 2004-2005 Tor Slettnes.

    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 
    with the Debian GNU/Linux distribution in the file 
    /usr/share/common-licenses/GPL-2+; if not, write to the Free Software
    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
    MA 02110-1301 USA.