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

A content transmission method for transmitting content, whose copying is controlled, the content transmission method comprising the steps of:

• 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.

A computer program described in a computer-readable form so that processing for transmitting content, whose copying is controlled, is executed by a computer system, the computer program allowing the computer system to execute the steps of:

• 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.

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

• an authentication section performing an authentication procedure between the content transmission device and a content receiving device;
• a first copy-control-information processing section processing first copy control information describing copy control information concerning the content;
• a second copy-control-information processing section processing second copy control information including content information different from the first copy control information;
• and
• a content transmission section 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.