Platform for Privacy Preferences (P3P)

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Sites make assertions about their privacy practices.

Users express their privacy preferences over those practices.

Negotiation between the site's supported and user's desired practices results in an agreement.

The interaction between the site and user is flexible. Users can find the level of privacy most appropriate for their sense of privacy and the type of interaction they wish to have with that site.

Joseph Reagle, W3C/LCS/MIT