This file is indexed.

/usr/share/doc/xfce4/copyright is in xfce4 4.8.0.3.

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 pseudo meta package was cobbled together by Martin Loschwitz on
July 20th, 2003.

Xfce is © 1996-2007 Olivier Fourdan <fourdan@xfce.org>

The packaging is © The pkg-xfce debian team and is licensed under the GNU
GPL version 2 or later.

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