The present invention relates to steganographic encoding for multimedia
content. In one combination, a method is provided including: encoding
first information in a first component of a multimedia signal, the first
component comprising audio, the first information being encoded though
subtle changes to data representing the first component; encoding second
information in a second component of the multimedia signal, the second
component comprising video, the first information being encoded though
subtle changes to data representing the first component, the first
information and the second information are associated. Of course, other
combinations are provided as well.