>Or license plates could become programable e-ink displays that display a new hash every X minutes Once a week would likely be enough. The point is that you ca

>Or license plates could become programable e-ink displays that display a new hash every X minutes Once a week would likely be enough. The point is that you can no longer associate "Plate ABCDEF was at this location at this time" with "Car owned by person X was at this location at this time" without making a lookup in a database that's owned by the government.