There was a standardization process, then the committee in charge of it gave up on it because it wasn't going anywhere except IE. See the home page of the worki

There was a standardization process, then the committee in charge of it gave up on it because it wasn't going anywhere except IE. See the home page of the working group (http://www.w3.org/P3P/ http://www.w3.org/P3P/). It's time IE woke up to that reality.