The German translation isn't perfect, but this site describes a privacy product that defeats security cameras. A simple IR LED array in a headband is able to oversaturate the pixels in the camera's CCD to the point where even adjacent pixels are effected, shrouding the wearer's face in a white halo.
Infrared Light Against Security Cameras - [via] Link
http://www.hackszine.com/blog/archive/2008/02/led_security_camera_disruptor.html