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/usr/share/doc/slang-expat/copyright is in slang-expat 0.5.0-2.

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The actual contents of the file can be viewed below.

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This package was debianized by Rafael Laboissiere <rafael@debian.org> on
Fri, 31 Aug 2007 13:41:44 +0200

It was downloaded from

    http://www.cheesit.com/downloads/slang/slexpat.html

Copyright Holder: Paul Boekholt <p.boekholt@hetnet.nl>

License:

According to slexpat.html:
    slexpat is Copyright (c) 2006, 2007 Paul Boekholt. Released under the
    terms of the GNU GPL (version 2 or later).

In Debian systems, the complete text of the Gnu GPL can be found in
`/usr/share/common-licenses/GPL-2'.