The World Wide Web Consortium (W3C) developed P3P as a standard protocol to enable Web users to take more control over their individual privacy settings. P3P was officially recommended as a standard on April 16, 2002.
W3C, The Platform for Privacy Preferences 1.0 (P3P1.0) Specification. [Online, April 16, 2002.] http://www.w3.org/TR/P3P/.