About: http://webisa.webdatacommons.org/52180290

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	The idea of charging for the Pro version as you describe is a good one.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com