About: http://webisa.webdatacommons.org/300160863

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	Block 21 can be executed after the system verifies that the user is authorized, such as by checking an identification number and password.
http://www.w3.org/ns/prov#wasQuotedFrom	freepatentsonline.com