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/usr/share/doc/sndfile-tools/copyright is in sndfile-tools 1.03-7.1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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This package was debianized by Erik de Castro Lopo <erikd@mega-nerd.com> on
Sun, 13 Dec 2009 16:19:18 +1100.

It was downloaded from: http://www.mega-nerd.com/libsndfile/tools/

Upstream Author: Erik de Castro Lopo <erikd@mega-nerd.com>

Copyrights:

  Copyright (C) 2007-2009 Erik de Castro Lopo <erikd@mega-nerd.com>
  Copyright (C) 2007 Jonatan Liljedahl <lijon@kymatica.com>

The files in the upstream source tarball are under the GPL2+ license. Each
source code file has license block at the top.

The complete text of the GPL licenses can be found on Debian systems at

    /usr/share/common-licenses/GPL-2
    /usr/share/common-licenses/GPL-3
  
Debian packaging copyright:

  (C) 2009 Erik de Castro Lopo <erikd@mega-nerd.com>

  All changes by Erik de Castro Lopo may be redistributed under the same
  terms as sndfile-tools itself.