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http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Copyright protection may be 50 to 70 years after the death of the last surviving author, 95 years from publication date, or other copyright protection term.
http://www.w3.org/ns/prov#wasQuotedFrom	pdinfo.com