We have the technology to do that. And what's more, although some of those things sounded a bit counter-intuitive, like proving I'm over 18 without proving who I am, the cryptography to do that not only exists, it's extremely well-known and well-understood. Digital signatures, the blinding of public key certificates, these technologies have been around for a while, we've just had no way of packaging them up. So the technology already exists. We know it works, There are a few examples of the technology being used in experimental places. That's London Fashion Week, where we built a system with O2, that's for the Wireless Festival in Hyde Park, you can see the persons walking in with their VIP band, it's just being checked by the Nokia phone that's reading the band. I'm only putting those up to show you these things are prosaic, this stuff works in these environments. They don't need to be special.