Ah, yes. Any driverless car must have remote sensing, probably optical (audio, too?) and almost certainly that sensing data must be stored for some period of time, shorter or longer. Who is the owner of the data, then? Is it the owner/operator of the vehicle? Is it, e.g. Volvo "because we need the data for compliance"? Might it be The Government, who will make data access a provision of the licensing? Just who will be able to obtain a copy of the car's data, and in what circumstances? This is a question that I shall want to be answered long before I consider a driverless car of my own.
Dystopian vision: Google (tm) will license their driverless car technology to manufacturers, on condition that they get data on car journeys "to improve my travelling experience".