From Eric’s “Canon’s Iris Registration Mode – Biological Copyright Metadata” (Photography Bay: 9 February 2008):
A recent Canon patent application (Pub. No.: US 2008/0025574 A1) reveals the next step in digital watermarking – Iris Registration.
The short and sweet of it?
1. Turn the Mode dial to “REG”
2. Choose between “REG 1″ through “REG 5″ (for up to 5 registered users)
3. Put eye to viewfinder
4. Look at display of center distance measurement point
5. Press the shutter button
6. Iris image captured
7. Go shoot
Additional embedded info can be added later. All metadata will be added to images after you’re finished shooting in a collective manner and not for each image. The purpose of the collective tagging, if you will, is to refrain from hampering the camera’s speed (frames per second) while shooting.