About: http://webisa.webdatacommons.org/137057967

Property	Value
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	In another aspect of the invention, a particular medium, for example a CD or a DVD, may be provided with an invisible authentication mark or code in the form of a pattern of light sensitive material.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com