About: http://webisa.webdatacommons.org/134817076

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	They help to prevent network attacks, viruses, worms, Trojan horses, spyware, and other security threats from entering the internal networks.
http://www.w3.org/ns/prov#wasQuotedFrom	ciscopress.com