What about having some sort of UV LED light that would shine above or below your plates so as to obscure any cameras?
"The trick is that that the frame is basically a optically-triggered slave-mode flash unit that’s placed right up to the subject (the license place). A sensor at the top of the frame detects when a flash is fired, which in turn instantly triggers two xenon flashes built into the sides. The powerful flash will turn your license plate into a rectangle of blown-out highlights."
It's illegal, of course.
I much prefer the idea of getting a custom plate that's something like 00000O0000 or 1111l11111 etc. depending on the font.
It doesn't work. Mythbusters tried it.
http://www.forbes.com/sites/adamtanner/2013/07/10/data-broke...
Also, the plate readers, they don't even use flashes. They are essentially video cameras.
We didn't.
In Australia, at least, red light cameras are cameras, and they do have a flash (you can see it go off). The plate readers on the freeways for tolls are more like video cameras.