Concepts

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AgreementID
A small unit of information that indicates both parties have agreed on a common proposal. An agreementID is the fingerprint of an accepted proposal. The presence of the agreementID in the P3P headers is the definitive declaration of which agreements for a given realm are in effect for a given transaction.
Assuring Party
Within P3P, an assuring party is an entity which makes some statement of assurance about a proposal (e.g. that practices are audited, or are in compliance with certain data collection guidelines).
PUID
PUID := hash(GUID, Realm, AgreementID). The PUID is an optional way for the user to identify herself to a service under a particular agreement. PUIDs correspond directly to a specific realm and agreement. PUIDs are like cookies, but are under P3P control and are simple numberical values.

Joseph Reagle

W3C