Copyright for po-debconf source package in Trusty

po-debconf is
  Copyright (c) 2002 Denis Barbier 
  Copyright (c) 2002 Martin Quinson 

This program is released under the terms and conditions of the GNU
General Public License (GPL).  On Debian GNU/Linux systems, the complete
text of the GNU General Public License may be found in
`/usr/share/common-licenses/GPL'.