The Platform for Privacy Preferences 1.0 (P3P1.0) Specification is a printed version of the specification of the Platform for Privacy Preferences (P3P). This document, along with its normative references, includes all the specification necessary for the implementation of interoperable P3P applications. This is a W3C Working Draft for review by W3C members and other interested parties. This document has been produced by the P3P Specification Working Group as part of the P3P Activity. This Working Draft includes an extension mechanism that can be used to extend the P3P vocabulary. The Working Group is particularly interested in feedback on how to improve this mechanism as well as examples of extensions that people would like to propose. These examples may be useful for improving the design of the extension mechanism. The introduction to this document (Section 1) provides additional information about the status of this Working Draft and future versions of P3P.