Receiving device, recording and reproducing device and receiving/recording-reproducing system for digital broadcast signal

A receiving device, comprising:

• a signal demodulator circuit for demodulating an encrypted video signal and attribute information including information for decoding an encryption;
• an attribute information identifying circuit for identifying and outputting the attribute information;
• and
• a descramble circuit for descrambling the video signal obtained from said signal demodulator circuit according to the output obtained from said attribute information identifying circuit, and
• wherein the output of said descramble circuit is outputted for recording;
• and
• wherein the receiving device further includes an electronic watermark, which is embedded in the video signal, processing circuit, and wherein a CGMS signal, which is superimposed in a vertical blocking area, obtained from said electronic watermark processing circuit is outputted to a recording device to control copying of said recording device.

A receiving device, comprising:

• a signal demodulator circuit for demodulating an encrypted video signal and attribute information including each encryption key and each channel key indicative of a 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 circuit and outputting the same therefrom;
• a decryption circuit for outputting a decryption key from the channel key outputted from said channel key selection circuit and the encryption key;
• a descramble circuit for unlocking the scramble of the video signal obtained from said signal demodulator circuit, based on the decryption key;
• and
• a re-scramble circuit for re-scrambling the descrambled video signal using the encryption key, and
• wherein the output of said re-scramble circuit is outputted for recording.

A receiving device, comprising:

• a signal demodulator circuit for demodulating an encrypted video signal and attribute information including each encryption key and each channel key indicative of a 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 channel according to the device ID signal and the channel key from the channel key detection circuit and outputting the same therefrom;
• a decryption circuit for outputting a decryption key from the channel key outputted from said channel key selection circuit and the encryption key;
• a descramble circuit for unscrambling the video signal obtained from said signal demodulator circuit, based on the decryption key;
• and
• a re-scramble circuit for re-scrambling the descrambled video signal,
• wherein the output of said re-scramble circuit is outputted for recording.