The present invention relates to a policy decision point for interacting with a computer system comprising a plurality of resources, to which subjects' access is controlled by corresponding policy enforcement points. The PDP comprises: a memory storing at least two policy packages, each controlling access rights to resources, and a connection table associating each policy package with an end point address; a network interface operable to communicate with the PEPs, wherein the network interface obtains access requests from a PEP and returns access decisions to the PEP, each access request comprising an end point address for directing the access request to the PDP; and a processor operable to: analyze an access request and determine, based on the end point address receiving the access request, an associated policy package; and evaluate the access request against the policy package thus determined.