Patent ID: 6674858
Filing Date: 2004-01-06
Classification: H04N

Abstract:
A receiving device, comprising:a signal demodulator circuit for demodulating an encrypted video signal and attribute information including an encryption key and a channel key indicative of each broadcast channel; a channel key detection circuit for detecting a channel key from the attribute information; an encryption key detection circuit for detecting an encryption key from the attribute information; a device ID generating circuit for generating a unique device ID signal; a channel key selection circuit for selecting a channel key for a receivable channel according to the device ID signal and the channel key from the channel key detection antenna and outputting the selected channel key; a decryption circuit for outputting a decryption key from the channel key outputted from said channel key selection circuit and the encryption key; and a descramble circuit for unscrambling the video signal obtained from said signal demodulator circuit by using the decryption key, and wherein the output of said descramble circuit is outputted for recording.