>Here's another one, http://www.nauto.com, which I mention as the
>recording of license plates and everything else in the surround,

Nearly 20 years ago, I first heard of "3M Louvered film", thin plastic sheets with opaque black plastic molded perpendicularly to the plane of the sheet.  It would be very useful to help block the viewing of license plates from the side of the road, or above on poles or overpasses.  Google-search '3M louvered film".    http://www.apioptics.com/pdf/3M-Display-Film-Summary.pdf

    http://www.freepatentsonline.com/3919559.html   

  http://www.freepatentsonline.com/EP0466460A2.html    Two sheets installed perpendicularly to each other would render a license plate readable only from a limited viewing cone behind, or in front of, the car.