1. A method, in a data processing system, for centralized policy management of multiple security domains in accordance with an illustrative embodiment, the method comprising: receiving an access request at a policy enforcement point component in the data processing system, wherein the policy enforcement point component is managed by a plurality of security domains; querying, by the policy enforcement point component, a policy broker component in the data processing system; determining, by the policy broker component, an access decision that complies with policies of the plurality of security domains; and returning, by the policy broker component, the access decision to the policy enforcement point component.