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/usr/share/doc/libao-common/copyright is in libao-common 1.1.0-3ubuntu1.

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 Christopher L Cheney <ccheney@debian.org> on
Sun, 29 Oct 2000 00:39:24 -0500.

It was downloaded from http://www.xiph.org/downloads/:

    URL:<http://downloads.xiph.org/releases/ao/libao-0.8.6.tar.gz>

Upstream Authors:
            Aaron Holtzman
            Stan Seibert <volsung@xiph.org>
            Jack Moffitt <jack@xiph.org>
            Ralph Giles <giles@xiph.org>
            Warren Dukes <shank@xiph.org>

Copyright:

Originally Copyright (C) Aaron Holtzman - May 1999
Changes Copyright (C) Stan Seibert - July 2000-March 2004

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
/usr/share/common-licenses/GPL file.