Copyright for polygen source package in Xenial

PolyGen was packaged for Debian by Enrico Zini 
on Wed Sep 15 13:43:37 CEST 2004

It was downloaded from:
 http://polygen.org/web/Download.424.0.html

Upstream author: Alvise Spanò 

Copyright (C) 2002-03 Alvise Spanò

The grammar files are copyright of their respective authors, as indicated
inside the grammar file.

License:

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.

On Debian systems, the complete text of the GNU General Public License can be
found in /usr/share/common-licenses/GPL-2 file.