Conveys prohibited actions which an information custodian, receiver, or user is not permitted to perform unless otherwise authorized or permitted under specified circumstances. Usage Notes: ISO 22600-2 species that a Refrain Policy "defines actions the subjects must refrain from performing". Per HL7 Composite Security and Privacy Domain Analysis Model: May be used to indicate that a specific action is prohibited based on specific access control attributes e.g., purpose of use, information type, user role, etc.