P3P is a position-independent config.txt directive that does not interact with any other directives.
P3P is the abbreviation for Platform for Privacy Preferences. The details of this standard are available at www.w3.org/P3P/. The purpose of this standard is to specify information on how sites store and make use of personally identifiable information.
The P3P directive is followed by the compact policy that should be sent when a cookie is set. For example,
P3P CP="IDC DSP COR CURa ADMa OUR IND PHY ONL COM STA"
specifies one possible compact policy.