Your iris as photo watermark
Canon apparently sees an opportunity to automate the watermarking process on the camera--making use of biometric data courtesy of the photographer's iris.
Photographers whose work appears online--and nowadays that's just about all of them, really--are all too aware of how easily their photos can be misappropriated. They can add a watermark on each picture, of course, but that typically involves post-shoot work with image-editing software. Canon apparently sees an opportunity to automate the process on the camera--making use of biometric data courtesy of the photographer's iris.
Read more about the patent at the Photography Bay blog: "Canon's Iris Registration Mode - Biological Copyright Metadata"