Canon apparently has filed a patent that would grab an image of your iris when you take a photo, and adds it to the metadata for each image. http://www.photographybay.com/2008/02/09/canon-iris-registration-watermark/
Canon apparently has filed a patent that would grab an image of your iris when you take a photo, and adds it to the metadata for each image. http://www.photographybay.com/2008/02/09/canon-iris-registration-watermark/