The solution, from a personal privacy standpoint, could be to obscure your license plate to prevent a proper photograph from being taken. I have read of invisible film and transparent sprays that purport to do just this.

There are also very affordable "license plate flippers" which, at the push of a button, rotate both your front and rear plates to different plates.

Both of these methods are likely illegal for driving, but may be legal when parked on private property.