1. An identification document for a subject, comprising: a) a substrate; b) a visual image formed on the substrate or a recording layer over the substrate, such visual image including at least a face image of the subject in a first area; and c) invisible but retrievable embedded information formed in the face image in the first area but not formed in a second area of the visual image, such embedded information corresponding to the identity of the subject and being usable for identifying the subject.