> Anyway, how does BT's cleanfeed work? How are British 3G > operators doing equivalent blocking? I'd be interested in > learning about the implementation.
Well, first of all Cleanfeed's not perfect. And it's not that secret either. http://www.cl.cam.ac.uk/~rnc1/cleanfeed.pdf --Michael Dillon P.S. Although I work for BT, I have no involvement with the group that is repsonsible for Cleanfeed. All that I know about it, I learned via Google.
