Electronic steganographic techniques can be used to encode a rights management control signal onto an information signal carried over an insecure communications channel. Steganographic techniques ensure that the digital control information is substantially invisibly and substantially indelibly carried...http://www.google.com.au/patents/US20010026618?utm_source=gb-gplus-sharePatent US20010026618 - Steganographic techniques for securely delivering electronic digital rights management control information over insecure communication channels
Steganographic techniques for securely delivering electronic digital rights ...
