A computer readable medium having a data packet stored therein for causing a functional change in the operation of a device is disclosed. In one embodiment, the data packet is comprised of a scalably encoded, progressively encrypted data portion. In the present embodiment, the data packet further includes...http://www.google.com/patents/US7155010?utm_source=gb-gplus-sharePatent US7155010 - Signal format that facilitates easy scalability of encrypted streams
