About: http://webisa.webdatacommons.org/340081292

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	So you could just limit Protected<T> to only take reference types as parameter (add a where T : class clause).
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com