Platform for Privacy Preferences Project P3P
The Platform for Privacy Preferences Project (P3P) enables Websites to
express their privacy practices in a standard format that can be
retrieved automatically and interpreted easily by user agents. P3P
user agents will allow users to be informed of site practices (in both
machine- and human-readable formats) and to automate decision-making
based on these practices when appropriate. Thus users need not read
the privacy policies at every site they visit.
More information
http://www.w3.org/P3P/