A distribution server distributes A/V content to a recipient according to
terms determined from information stored in a database of prior
unauthorized copying attributed to that recipient. The copy distributed
to the recipient includes identifications of the content and recipient
embedded in it by an ID embedder employing a steganographic or
watermarking technique. A detection server detects embedded ID's in A/V
content sampled from various distribution channels, and provides the ID
information to the distribution server to update the database of prior
unauthorized copying.