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/usr/share/doc/pmx/copyright is in pmx 2.7.0.ctan20131214-1.

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The actual contents of the file can be viewed below.

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This package was Debianized by Anthony Fok <foka@debian.org> on
Mon, 28 Jul 1997 03:45:49 -0600.

Now maintained by the Debian TeX Debian, in particular 
Roland Stigge <stigge@antcom.de> and Norbert Preining <preining@debian.org>.

It was downloaded from
	http://mirrors.ctan.org/support/pmx.zip
	http://mirrors.ctan.org/install/support/pmx.tds.zip
and repacked. Details are in the script debian/get-orig-sources

Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007 Don Simons <dsimons@adelphia.net>

You are free to distribute this software under the terms of
the GNU General Public License.
On Debian systems, the complete text of the GNU General Public
License can be found in the file `/usr/share/common-licenses/GPL'.

Acknowledgements (from the PMX manual):

    To Daniel Taupin, Ross Mitchell, and Andreas Egler for creating MusiXTeX,
    to Olivier Clary for suggesting a crucial modification in the note-entry
    scheme, to my colleague John DiPol (a non-musician!) for the idea of using
    binary masks to define beam groupings, to Eric Petersen and Stephan Evert
    past help in porting PMX to other platforms, to Joel Hunsberger for
    unravelling some deep MusiXTeX tangles, to Dirk Laurie for making PMX
    accessible to vocal music by creating M-Tx, to Stanislav Kneifl and Hiroaki
    Morimoto for developing the postscript slur packages, and to Christian
    Mondrup, Andre Van Ryckeghem, Christof Biebricher, Joerg Anders, and other
    denizens of the TeX-music mailing list for first-class bug-finding.
    Finally, I want to mention again the invaluable contributions by Werner
    Icking: his exhaustive beta testing, uncanny bug-finding, continuing
    encouragement, and promotion of PMX right up until his sudden and premature
    departure from this earthly realm.