About: http://webisa.webdatacommons.org/296659250

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	Probably the most popular, modern way is using Kerberos and PAM. The old standy is NIS. Some people might point you at OpenLDAP, but keep in mind that LDAP is a directory service, not an authentication service.
http://www.w3.org/ns/prov#wasQuotedFrom	serverfault.com