* Apache Jena has named-graph level access control: https://jena.apache.org/documentation/fuseki2/fuseki-data-access-control.html#graph-acl * ... and also Virtuoso: https://vos.openlinksw.com/owiki/wiki/VOS/VirtRDFGraphsSecurity * GraphDB has a per-DB (repository) level access control: https://graphdb.ontotext.com/documentation/10.0/secure-graphdb-server.html#users-and-roles * see also: https://ceur-ws.org/Vol-181/paper3.pdf