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/usr/share/doc/macutils/copyright is in macutils 2.0b3-16build1.

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The actual contents of the file can be viewed below.

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This package was debianized by Vincent Renardias <vincent@waw.com> on
Wed, 6 Nov 1996 21:28:45 +0100.

It was downloaded from 
<ftp://ftp.ibp.fr/pub/linux/sunsite/utils/compress/macutils.tar.gz>

Original Upstream Copyright Notice:

--
Note:
In these programs all algorithms are implemented based on publicly available
software to prevent any claim that would prevent redistribution due to
Copyright.  Although parts of the code would indeed fall under the Copyright
by the original author, use and redistribution of all such code is explicitly
allowed.  For some parts of it the GNU software license does apply.
--

Clarified Copyright Notice:
--
Almost all of the code is either created by me from scratch or loosely
based on *algorithms* that are publicly available.  Most of the algorithms
are actually found by reverse engineering and interpretation of the results.
In some cases the algorithms came from the acknowledged sources, but the
implementation is my own.

As far as sources are concerned, the only execptions are
macutil/de_compress.c and macutil/de_lzah.c  They have a clear relation
with the original source.  de_lzah.c is loosely based on LZSS.C in
LHarc.  As the file says:
        4/6/1989 Haruhiko Okumura
        Use, distribute, and modify this program freely.

[..]

The point where GPL might come in is in the Zoom part (macutil/zma.c),
but I do not think this is so; the algorithm is found from a file
mailed to me by the author, which would fall under the GPL, but the
implementation is completely different.

      - Dik T. Winter <Dik.Winter@cwi.nl> Thu, 22 Feb 2001 13:30:58 +0100
-- 

Clarified Licensing Terms:
--
According to Dutch law it is *not* possible to release something in the
public domain.  So I might state that but I would not be bound by it...
Yup, copyright is a mess.  But I indeed do have the copyright, but it may
be distributed and used for any purpose.

      - Dik T. Winter <Dik.Winter@cwi.nl> Thu, 22 Feb 2001 15:38:37 +0100
--

The full text of the GPL is available in /usr/share/common-licenses/GPL.