CableLabs CableLabs This document specifies a participant-facing protocol for Privacy Preference Declarations (PPDs) in home networks. The protocol is between a home-side PPD service endpoint and a device-side actor, formally the PPD participant, which is a device or a service acting on behalf of a device. It defines baseline operations for endpoint metadata confirmation, participant registration, optional participant declaration, effective-policy retrieval, policy acknowledgment, renewal, and reassociation. This document complements the PPD architecture and taxonomy documents by defining the message and sequencing behavior needed for interoperable policy signaling. The household policy instances carried by this protocol express privacy preferences for signaling and comparison; they do not by themselves define an enforcement mechanism that guarantees participant behavior.