This file is indexed.

/usr/share/doc/squirrelmail-compatibility/copyright is in squirrelmail-compatibility 2.0.16-1.

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

The actual contents of the file can be viewed below.

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Format-Specification: http://wiki.debian.org/Proposals/CopyrightFormat?action=recall&rev=423
Upstream-Name: compatibility
Upstream-Maintainer: Paul Lesniewski <paul@squirrelmail.org>
Upstream-Source: http://www.squirrelmail.org/plugin_view.php?id=152

Files: *
Copyright: © 2004-2009 Paul Lesniewski <paul@squirrelmail.org>
License: GPL-2
 This program is free software; you can redistribute it and/or modify it under
 the terms of the GNU General Public License version 2 as published by the Free
 Software Foundation.

Files: */index.php
Copyright: © 1999-2009 The SquirrelMail Project Team
License: GPL-2
 This program is free software; you can redistribute it and/or modify it under
 the terms of the GNU General Public License version 2 as published by the Free
 Software Foundation.

Files: debian/*
Copyright: © 2008-2009 Jan Hauke Rahm <jhr@debian.org>
License: GPL-2+
 This package is free software; you can redistribute it and/or modify it under
 the terms of the GNU General Public License as published by the Free Software
 Foundation; either version 2 of the License, or (at your option) any later
 version.

On Debian systems, the complete text of the GNU General Public License
can be found in file "/usr/share/common-licenses/GPL-2". Possible later
versions are found within the same directory (e.g. 
"/usr/share/common-licenses/GPL-3").