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/usr/share/doc/libio-digest-perl/copyright is in libio-digest-perl 0.10-1.1.

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

The actual contents of the file can be viewed below.

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This is the debian package for the IO-Digest module.

It was downloaded from the Comprehensive Perl Archive Network (CPAN).
Visit <http://www.perl.com/CPAN/> to find a CPAN site near you.

The upstream author is: 

Chia-liang Kao <clkao@clkao.org>.

Copyright 2004 by Chia-liang Kao <clkao@clkao.org>.

This program is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.

See http://www.perl.com/perl/misc/Artistic.html

Perl is distributed under your choice of the GNU General Public License or
the Artistic License.  On Debian GNU/Linux systems, the complete text of the
GNU General Public License can be found in `/usr/share/common-licenses/GPL'
and the Artistic Licence in `/usr/share/common-licenses/Artistic'.