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Privacy policies often place requirements on the purposes for which agoverned entity may use personal information. For example, regulations, such asHIPAA, require that hospital employees use medical information for only certainpurposes, such as treatment. Thus, using formal or automated methods forenforcing privacy policies requires a semantics of purpose requirements todetermine whether an action is for a purpose or not. We provide such asemantics using a formalism based on planning. We model planning using amodified version of Markov Decision Processes, which exclude redundant actionsfor a formal definition of redundant. We use the model to formalize when asequence of actions is only for or not for a purpose. This semantics enables usto provide an algorithm for automating auditing, and to describe formally andcompare rigorously previous enforcement methods.

On the Semantics of Purpose Requirements in Privacy Policies