Some picture noise removal programs allow you to supply a "noise profile picture". This involves leaving your lens cap on and taking a long exposure so that the

Some picture noise removal programs allow you to supply a "noise profile picture". This involves leaving your lens cap on and taking a long exposure so that the only thing in your picture is the noise inherent in the camera's sensor. The noise pattern on any given sensor is fairly unique, unique enough that these programs can then use that profile to "subtract" noise from pictures you take. Perhaps people could register their noise profiles with a service like Flickr and, if their camera is stolen, this noise profile could be detected in pictures found on the web.