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A realm is basically a resource which is able to authenticate users. Apache Ki (and therefore OntoBroker) support the following realms:

JDBC realm (allows to use a SQL database for storing users and passwords)
LDAP realm
ActiveDirectory realm

OntoBroker also provides its own realm: SecurityModuleRealm. This realm is using an ontology (written in ObjectLogic) for specifying users, roles and permissions to modules. It also allows you to create powerful rules (e.g. all users with read permissions on module A also have read permissions on module B).