RunningMan:
What are the privacy implications of collecting and storing information such as rego numbers?
absolutely none.
in fact its legally required for it to be publicly available data from the govt. not sure if you remember the stink over that as it was costing govt a ton to keep providing that data, so they starting charging for it to reduce the amount of frivolous uses. this impacted websites like carjam, who in turn had to pass on the cost to their customers.