About: http://webisa.webdatacommons.org/201200388

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 payload of the second watermark can convey essentially any data, such as image metadata, date/time information, annotations by prior image users, digital signature or other authentication data, security keys, etc.
http://www.w3.org/ns/prov#wasQuotedFrom	google.fr