In Anglo-Saxon law, an exclusive right is a de facto, non-tangible prerogative existing in law (that is, the power or, in a wider sense, right) to perform an action or acquire a benefit and to permit or deny others the right to perform the same action or to acquire the same benefit. A "prerogative" is in effect an exclusive right. The term is restricted for use for official state or sovereign (i.e., constitutional) powers. Exclusive rights are a form of monopoly.