This file is indexed.

/usr/share/doc/xfce4-mixer/copyright is in xfce4-mixer 4.10.0-3.

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 Martin Loschwitz <madkiss@debian.org> on
Sun, 20 Jul 2003 16:35:47 +0200.

You can fetch xfce4-mixer from the official Xfce website, which is
http://www.xfce.org/

Upstream authors is Jannis Pohlmann <jannis@xfce.org>

File: *
Copyright: © 2008 Jannis Pohlmann <jannis@xfce.org>
License: GPL-2+

On Debian systems, the complete text of the GNU General
Public License can be found in `/usr/share/common-licenses/GPL-2'.