License Plate Lookup On Whoever You Want
Today's technology allows you to lookup on any license plate, on websites such as snappylookup.com, which makes performing a license plate lookup a breeze.
For a small fee you could easily lookup on anyone, not only license plate by the way but also criminal records, DUI records and more. All you need is a working credit or debit card loaded with a some money and one "lead", which could be a license plate.
Funny enough, this information is available while other "public records" are hidden, such as internet domain name (in some cases). If you really wish to block on anyone looking up your license plate number then the only viable solution to date is to rent a car. That way the car is registered on the agency you used and unless they do not expose you - you're all set with privacy.