Blocked out number plates? Even if I knew how to do it on the computer or, even if I had some tape to cover the plates - I just couldn't be bothered with all that stuff! What are the chances of someone cloning your 1970s VW bus? Not a lot, I bet. Anyway, if that cloned bus when through a speed camera, it's pretty easy to prove it wasn't you. I've got better things to worry about thanks.
Can't say i've ever seen the point, there's enough car regs out there on the net, everyone i drive past see's the reg so what harm is a few pics gonna do