Patent ID: 7177427
Filing Date: 2007-02-13
Classification: G11B,H04L,H04N

Abstract:
1. A system for transferring information, said system comprising: a source device that encodes an encryption mode identifier (EMI) code into an information packet and that transmits said encoded information packet over a communication interface, said source device comprising: a sink device that receives said encoded information packet from said communication interface, said sink device comprising: indicating that said EMI code is of said second mode; wherein an unauthorized change in said EMI code from said first mode to said second mode, after said first encryption circuit encrypts said encoded information packet, causes decryption of said received information packet with said second decryption circuit, rendering said information packet inaccessible; and wherein said first mode is a copy prohibition mode indicating that said information packet is not to be reproduced by said sink device and wherein said second mode is a copy once inhibition mode indicating that said information packet is not to be reproduced more than once by said sink device.