driver knows they can take this call because it is credit card, essentially using credit cards and preregistration to get the liability for drivers and customers that is the core of the uber model. it's not in here -- we have people talk about it -- my question is, why not put it in here? and if not which may be a little bit late to do, it is something that we can develop relatively soon? again my personal preference being to have a rather open-ended rule that allows the companies in the app to design this the way they think best, basically allowing credit card registration, pretrip information, and dispatch premiums as well as blown call penalties. >> we would not be precluded from setting up that kind of system. in fact it might be something that would be addressed in terms and conditions with the app providers that use the data, we want you for ma