Eye recognition
Worried about your digital photographs being used by someone else? Canon has apparently just filed for an iris registration patent, whereby your images would be watermarked based on your very own photographic eye.
Another object of the present invention is to provide an imaging apparatus that makes it possible to protect the copyright of photographic images by reliably acquiring biological information of a photographer for the purpose of personal authentication and writing this photographer information to the image of a subject without affecting processing, and in a manner transparent to operation, at the time of photography.
Some comments here about some of the obvious concerns and issues.