JP2006252761A5

JP2006252761A5 -

Info

Publication number: JP2006252761A5
Application number: JP2006117404A
Authority: JP
Filing date: 2006-04-21
Publication date: 2009-01-22

Claims

In the digital signal output device that receives a digital signal both transmitted and a second information for setting the necessity of protecting the first information and encryption indicating copy control output from the digital interface,
Receiving means for receiving the digital signal ;
Encryption means capable of encrypting the digital signal received by the receiving means in a plurality of encryption modes;
Output means for outputting the digital signal encrypted by the encryption means from the digital interface;
Control means for detecting the first information and the second information from the digital signal received by the receiving means, and controlling the encryption means and the output means based on the detected information;
The first information includes at least a first state indicating that copying is possible, a second state indicating that copying is possible once, and a third state indicating that copying is prohibited,
The control means outputs the first information without encryption when the first information is in the first state and the second information indicates that protection is unnecessary, and the first information is the first information. And when the second information indicates that protection is necessary, and when the first information is in the second state, the encryption means encrypts the first information in the first encryption mode. A digital signal output device characterized in that when the first information is in a third state, the encryption means encrypts the data in a second encryption mode and outputs the encrypted information.

In the first information and the digital signal output method of outputting from a digital interface both receiving the transmitted digital signal and second information for setting necessity of protection by the encryption indicating the copy restriction,
The first information includes at least a first state indicating that copying is possible, a second state indicating that copying is possible once, and a third state indicating that copying is prohibited,
Receiving the digital signal ;
Detecting the first information and the second information from the received digital signal ;
When the detected first information indicates the first state and the second information indicates that protection is not required, the first information is output without being encrypted, and the first information is in the first state. And when the second information indicates that protection is necessary and when the first information is in the second state, the encryption means encrypts the data in the first encryption mode and outputs it. And a digital signal output method characterized in that when the first information is in the third state, the encryption means encrypts and outputs in the second encryption mode.

In the digital signal transmission / reception method of transmitting a digital signal together with first information indicating copy restriction and second information for setting whether encryption protection is necessary or not, receiving the digital signal and outputting it from a digital interface,
The first information includes at least a first state indicating that copying is possible, a second state indicating that copying is possible once, and a third state indicating that copying is prohibited,
Transmitting the digital signal together with the first information and the second information;
Receiving the digital signal;
Detecting the first information and the second information from the received digital signal;
When the detected first information indicates the first state and the second information indicates that protection is not required, the first information is output without encryption, and the first information is in the first state. And when the second information indicates that protection is required and when the first information is in the second state, the encryption means encrypts and outputs in the first encryption mode. And a digital signal transmission / reception method characterized in that when the first information is in a third state, the encryption means encrypts the data in a second encryption mode and outputs the result.