Copyright for mgetty source package in Xenial

This is the Debian GNU/Linux prepackaged version of mgetty+sendfax
Mgetty was written by Gert Doering 
or 

You can find the source here:

  ftp://alpha.greenie.net/pub/mgetty/source/

This package was originally put together by:
    Nils Rennebarth 
and was subsequently been maintained by:
    Christoph Lameter, John Goerzen, and briefly Paul Haggart
at which point Philip Hands  took over (Mid 1997).

Since version 1.1.22, mgetty (and vgetty) is distributed under the GNU
GPL. On Debian GNU/Linux systems, the text of the GPL can be found in
the directory /usr/share/common-licenses/.

In the frontends directories (/usr/share/doc/mgetty/frontends/...):
  viewfax-2.5:
    Copyright (C) 1990, 1995  Frank D. Cringle 
    Distributed under the GNU GPL (see above)

  faxview-0.2:
    Copyright (C) 1994--1996 Ralph Schleicher 
    Distributed under the GNU GPL (see above)

  the "rs" utilities for Emacs:
    Copyright (C) 1995 Ralph Schleicher
    Distributed under the GNU GPL (see above)

  Many others whose distribution terms are explained in their source code...