Copyright for sed source package in Bionic

This is the Debian GNU/Linux prepackaged version of sed - the GNU stream
oriented editor.

This package was assembled from sources obtained from:
   ftp://ftp.gnu.org/gnu/sed/

It is currently maintained by Clint Adams 

Copyright: 1989,90,91,92,93,94,95,98,99,2002,2003,2006,2008,2009,2010 Free Software Foundation, Inc.

GNU sed 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 3, or (at your option) any later
version.

On Debian GNU/Linux systems you can find a copy of the GPL in
/usr/share/common-licenses/GPL-3

The sed info manual is released under the terms of the GNU Free
Documentation License as published by the Free Software Foundation;
either version 1.3, or (at your option) any later version.