Copy control method

A contents transmitting method implemented by a contents transmitting apparatus configured to transmit to a contents receiving apparatus connected via a network, contents and copy control information which controls copying of contents, wherein the contents transmitting method comprises:

• performing authentication processing with the contents receiving apparatus, and sharing an exchange key information or a dedicated key information with the contents receiving apparatus, wherein the exchange key information and the dedication key information are different with the exchange key information useable for encryption processing of content with the copy control information not having copy number information added thereto to limit a number of copies, and the dedicated key information useable for encryption processing of contents with the copy control information having copy number information added thereto to limit a number of copies;
• providing an encryption processing section configured to encrypt contents with a key created on a basis of the exchange key information or the dedicated key information;
• providing a communication processing section configured to transmit to the contents receiving apparatus via the network, encrypted contents and copy control information which controls copying the contents;
• and
• effecting control including:
• to control, if contents are not contents added with the copy number information, performing encryption processing with a key created on a basis of the exchange key information, and transmitting encrypted contents to the contents receiving apparatus via the network;
• and,
• to control, if contents are contents added with the copy number information, performing encryption processing with a key created on a basis of the dedicated key information, and transmitting encrypted contents to the contents receiving apparatus via the network;
• wherein:
• encrypted contents and copy control information which controls copying the contents, are composed of packets;
• and
• the effecting control further comprising:
• generating packets of encrypted contents and packets of the copy control information, the packets of encrypted contents and the packets of the copy control information being different from each other;
• and
• transmitting the packets of the copy control information before transmitting the packets of encrypted contents;
• and
• wherein when a status of copy control is changed during content transmission, generating a packet of copy control information which indicates the status of copy control of the contents, and transmitting the generated packets to the contents receiving apparatus.

A contents receiving apparatus configured to receive from a contents transmitting apparatus connected via a network, contents and copy control information which controls copying of contents, wherein the contents receiving apparatus comprises:

• at least one of a hardware processor and circuitry to effect:
• an authentication section configured to perform authentication processing with the contents transmitting apparatus, and to share an exchange key information or a dedicated key information with the contents receiving apparatus, wherein the exchange key information and the dedication key information are different with the exchange key information useable for encryption processing of content with the copy control information not having copy number information added thereto to limit a number of copies, and the dedicated key information useable for encryption and decryption processing of contents with the copy control information having copy number information added thereto to limit a number of copies;
• an decryption processing section configured to decrypt contents with a key created on a basis of the exchange key information or the dedicated key information;
• a communication processing section configured to receive from the contents transmitting apparatus via the network, encrypted contents and copy control information which controls copying the contents;
• and
• a control section configured:
• to control, if contents are not contents added with the copy number information, performing decryption processing with a key created on a basis of the exchange key information, on encrypted contents received from the contents transmitting apparatus via the network;
• and,
• to control, if contents are contents added with the copy number information, performing decryption processing with a key created on a basis of the dedicated key information, on encrypted contents received from the contents transmitting apparatus via the network;
• wherein:
• encrypted contents and copy control information which controls copying the contents, are composed of packets;
• and
• the control section is configured to:
• recognize packets of encrypted contents and packets of the copy control information, the packets of encrypted contents and the packets of the copy control information being different from each other;
• and
• receive the packets of the copy control information before receiving the packets of encrypted contents;
• and
• wherein when a status of copy control is changed during content transmission, the control section receives a packet of copy control information which indicates the status of copy control of the contents from the contents transmitting apparatus.

A contents receiving method implemented by a contents receiving apparatus configured to receive from a contents transmitting apparatus connected via a network, contents and copy control information which controls copying of contents, wherein the contents receiving method comprises:

• performing authentication processing with the contents transmitting apparatus, and sharing an exchange key information or a dedicated key information with the contents receiving apparatus, wherein the exchange key information and the dedication key information are different with the exchange key information useable for encryption processing of content with the copy control information not having copy number information added thereto to limit a number of copies, and
• the dedicated key information useable for encryption and decryption processing of contents with the copy control information having copy number information added thereto to limit a number of copies;
• providing decryption processing section configured to decrypt contents with a key created on a basis of the exchange key information or the dedicated key information;
• providing a communication processing section configured to receive from the contents transmitting apparatus via the network, encrypted contents and copy control information which controls copying the contents;
• and
• effecting control including:
• to control, if contents are not contents added with the copy number information, performing decryption processing with a key created on a basis of the exchange key information, on encrypted contents received from the contents transmitting apparatus via the network;
• and,
• to control, if contents are contents added with the copy number information, performing decryption processing with a key created on a basis of the dedicated key information, on encrypted contents received from the contents transmitting apparatus via the network;
• wherein:
• encrypted contents and copy control information which controls copying the contents, are composed of packets;
• and
• the effecting control further comprising:
• recognizing packets of encrypted contents and packets of the copy control information, the packets of encrypted contents and the packets of the copy control information being different from each other;
• and
• receiving the packets of the copy control information before receiving the packets of encrypted contents;
• and
• wherein when a status of copy control is changed during content transmission, the control section receiving a packet of copy control information which indicates the status of copy control of the contents, from the contents transmitting apparatus.