The ENTAGGED system is a small wireless Bluetooth module that plugs into your camera. It automatically associates people or products with their photos by directly embedding a barcode number into the photos's metadata.
Entagged currently writes the Barcode Data into the Comment field on Nikon cameras, or the Copyright field on canon cameras.
Now with using the Passcode Photos feature (password protecting individual photos in a gallery) Sytist will look in the comment and copyright fields in addition to the title field for the password.
Important note when using this feature: In Settings -> Photo Settings, the option to treat untitled photos as group photos option has to be disabled.