About: http://webisa.webdatacommons.org/205085124

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	Master is a system database and effectively belongs to MS - yes you can put your own stuff in there at the risk of (1) breaking something or (2) having a service pack or hotfix break something for you...
http://www.w3.org/ns/prov#wasQuotedFrom	sqlservercentral.com