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/usr/share/doc/pppoe/copyright is in pppoe 3.11-0ubuntu1.

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The actual contents of the file can be viewed below.

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This package was Debianized on the 30th of December 1999 by Christian Hudon
<chrish@debian.org> using source obtained from
http://www.roaringpenguin.com/pppoe.html

rp-pppoe is copyright © 1999-2000 Roaring Penguin Software Inc.

rp-pppoe is licenced under the GNU General Public License. On Debian
GNU/Linux systems, the full text of the GPL is available under
/usr/share/common-licenses/GPL.

Portions of the Debian version of rp-pppoe have been copied from the
net-tools package (from the files utils.c and ifconfig.c).  The
respective copyright statements are:

/* Copyright 1998 by Andi Kleen. Subject to the GPL. */

 * Author:      Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
 *              and others.  Copyright 1993 MicroWalt Corporation
 *
 *              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.

A patch from Sven Geggus has been applied, which adds the ability to
set the source MAC address.  According to personal communications,
this patch is subject to the GPL as well.