About: http://webisa.webdatacommons.org/48812255

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	If the PDF is a scanned document, then some scan software not only includes the scanned image (which is what you see), but also performs OCR to include hidden text in the same document (which is what you search and copy).
http://www.w3.org/ns/prov#wasQuotedFrom	superuser.com