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/usr/share/doc/libheap-perl/copyright is in libheap-perl 0.80-2.

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The actual contents of the file can be viewed below.

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Package: libheap-perl
CPAN Package: Heap

Upstream Author: John Macdonald, jmm@elegant.com.

Download Location: http://search.cpan.org/author/JMM/

Copyright statement:
---8<-------------------------
Copyright 1998, O'Reilly & Associates.

This code is distributed under the same copyright terms as perl
itself.
---8<-------------------------

Debianised:
  Matt Hope <dopey@debian.org>, 20030312

Perl is dual-licenced under "Artistic" and "GPL".
The text of the GPL licence is available from 
 /usr/share/common-licenses/GPL
The text of the Artistic licence is available from
 /usr/share/common-licenses/Artistic
The text of the Perl licence is available from
 /usr/share/doc/perl/copyright