The present invention discloses a method and system for embedding a
digital signature into an MPEG stream. In the preferred embodiment, the
digital signature is embedded in a plurality of PCR fields of a transport
stream and is encrypted and scrambled to avoid detection and removal.
Other embodiments are disclosed, each of which is designed to place a
digital signature in a pre-compressed MPEG stream while requiring minimal
computing resources to encode and decode the signature.