Content transmission device, content transmission method, and computer program used therewith

A content transmission device for transmitting content, whose copying is controlled, the content transmission device comprising:

• a processor configured to:
• perform an authentication procedure between the content transmission device and a content receiving device;
• process first copy control information describing copy control information concerning the content;
• process second copy control information including content information different from the first copy control information;
• and
• a transmitter configured to transmit a packet to the content receiving device, the packet including a header including the first copy control information and the second copy control information, and a payload obtained by encrypting the content with a predetermined content key, wherein
• the second copy control information includes mode information representing validity of the second copy control information included in the header and substitution information representing suitability of content-embedded copy control information concerning the first copy control information, and
• when the content transmission device performs transmission of the packet with the header including the first copy control information and the second copy control information, the processor is configured to describe information representing the transmission in an authentication command to be transmitted to the content receiving device.

A content transmission method performed by a content transmitting device for transmitting content, whose copying is controlled, the content transmission method comprising:

• performing, by a processor of the content transmission device, an authentication procedure between the content transmitting device and a content receiving device;
• setting first copy control information describing copy control information concerning the content;
• setting second copy control information including content information different from the first copy control information;
• and
• generating and transmitting a packet to the content receiving device, the packet including a header including the first copy control information and the second copy control information, and a payload obtained by encrypting the content with a predetermined content key, wherein
• under a transmission-system environment in which content transmission is performed by using a packet having a format including a header including a field in which the first copy control information is written and a payload including content in which content-embedded copy control information is embedded, the set second copy control information includes mode information representing validity of the second copy control information included in the header, and substitution information representing substitutability of content-embedded copy control information concerning the first copy control information.

A content transmission method performed by a content transmitting device for transmitting content, whose copying is controlled, the content transmission method comprising:

• performing, by a processor of the content transmission device, an authentication procedure between the content transmitting device and a content receiving device;
• setting first copy control information describing copy control information concerning the content;
• setting second copy control information including content information different from the first copy control information;
• and
• generating and transmitting a packet to the content receiving device, the packet including a header including the first copy control information and the second copy control information, and a payload obtained by encrypting the content with a predetermined content key, wherein
• the second copy control information includes mode information representing validity of the second copy control information included in the header and substitution information representing suitability of content-embedded copy control information concerning the first copy control information, and
• when transmission of the packet is performed in generating and transmitting the packet in a form in which the header includes the first copy control information and the second copy control information, in performing the authentication procedure, information representing the transmission is described in an authentication command to be transmitted to the content receiving device.

A non-transitory computer-readable medium including computer program instructions, which when executed by a content transmitting device, cause the content transmitting device to perform a method comprising:

• performing an authentication procedure between a content transmitting device and a content receiving device;
• setting first copy control information describing copy control information concerning the content;
• setting second copy control information including content information different from the first copy control information;
• and
• generating and transmitting a packet to the content receiving device, the packet including a header including the first copy control information and the second copy control information, and a payload obtained by encrypting the content with a predetermined content key, wherein
• under a transmission-system environment in which content transmission is performed by using a packet having a format including a header including a field in which the first copy control information is written and a payload including content in which content-embedded copy control information is embedded, the set second copy control information includes mode information representing validity of the second copy control information included in the header, and substitution information representing substitutability of content-embedded copy control information concerning the first copy control information.

A personal computer that is operable to transmit content, whose copying is controlled, the personal computer comprising:

• a processor configured to:
• perform an authentication procedure between the personal computer and a content receiving device;
• process first copy control information describing copy control information concerning the content;
• process second copy control information including content information different from the first copy control information;
• and
• a communication interface configured to transmit a packet to the content receiving device, the packet including a header including the first copy control information and the second copy control information, and a payload obtained by encrypting the content with a predetermined content key, wherein
• the personal computer is operable under a transmission-system environment in which content transmission is performed by using a packet having a format including a header including a field in which the first copy control information is written and a payload including content in which content-embedded copy control information is embedded, and
• the second copy control information processed by the processor includes mode information representing validity of the second copy control information included in the header, and substitution information representing substitutability of content-embedded copy control information concerning the first copy control information.

A content transmitting device for transmitting content, whose copying is controlled, the content transmitting device comprising:

• a memory configured to store contents;
• a processor configured to:
• perform an authentication procedure between the content transmitting device and a content receiving device;
• process first copy control information describing copy control information concerning the content;
• process second copy control information including content information different from the first copy control information;
• and
• a communication interface configured to transmit a packet to the content receiving device, the packet including a header including the first copy control information and the second copy control information, and payload obtained by encrypting the content with a predetermined content key, wherein
• the content transmitting device is operable under a transmission-system environment in which content transmission is performed by using a packet having a format including a header including a field in which the first copy control information is written and a payload including content in which content-embedded copy control information is embedded, and
• the second copy control information processed by the processor includes mode information representing validity of the second copy control information included in the header, and substitution information representing substitutability of content-embedded copy control information concerning the first copy control information.

A content transmitting device for transmitting content, whose copying is controlled, the content transmitting device comprising:

• a memory configured to store contents;
• a processor configured to:
• perform an authentication procedure between the content transmitting device and a content receiving device;
• process first copy control information describing copy control information concerning the content;
• process second copy control information including content information different from the first copy control information;
• and
• a communication interface configured to transmit a packet to the content receiving device, the packet including a header including the first copy control information and the second copy control information, and payload obtained by encrypting the content with a predetermined content key, wherein
• the second copy control information includes mode information representing validity of the second copy control information included in the header and substitution information representing suitability of content-embedded copy control information concerning the first copy control information, and
• when the content transmitting device performs transmission of the packet with the header including the first copy control information and the second copy control information, the processor is configured to describe information representing the transmission in an authentication command to be transmitted to the content receiving device.