This appendix was contributed by Lorrie Cranor of AT&T Labs—Research. It is copyright AT&T and reprinted with permission.
This appendix provides an overview of how P3P works and how you can obtain and use it. For more information about P3P, see http://www.w3.org/P3P/. That site includes pointers to the complete P3P specification, lists of P3P software and P3P-enabled web sites, and more detailed instructions for using P3P on your web site. For a complete discussion of P3P and how you can use it to best advantage, see the forthcoming book, P3P, by Lorrie Cranor.
The P3P specification includes a standard vocabulary for describing a web site’s data practices, a set of base data elements that web sites can refer to in their P3P privacy policies, and a protocol for requesting and transmitting web site privacy policies.
The P3P protocol is a simple extension to the ...