Method, system and program product for modifying content usage conditions during content distribution

A method for modifying content usage conditions during broadcast distribution, comprising the steps of:

• receiving encrypted content, content usage conditions, an encrypted combination of the content usage conditions and a title key, and a key management block (KMB);
• determining a key encrypting key based on the KMB;
• decrypting the encrypted combination using the key encrypting key;
• and
• modifying the content usage conditions.

A system for modifying content usage conditions during content distribution, comprising:

• a system for receiving encrypted content, content usage conditions, a message authentication code (MAC), and a key management block (KMB) from a content source;
• a system for determining a key encrypting key based on the KMB;
• a system for processing the MAC using the key encrypting key;
• and
• a system for modifying the content usage conditions.

A program product stored on a recordable medium for modifying content usage conditions during content distribution, which when executed, comprises:

• program code for receiving encrypted content, content usage conditions, an encrypted combination of the content usage conditions and a title key, and a key management block (KMB) from a content source;
• program code for determining a key encrypting key based on the KMB;
• program code for decrypting the encrypted combination using the key encrypting key;
• and
• program code for modifying the content usage conditions.

A method for accepting a proposed key management block (KMB), comprising the steps of:

• proposing a KMB to an existing device;
• authenticating the proposed KMB based on a key;
• and
• accepting the proposed KMB if the proposed KMB includes an existing KMB.