DIGITAL DATA RECORDING DEVICE, DIGITAL DATA MEMORY DEVICE, AND DIGITAL DATA UTILIZING DEVICE FOR CONVERTING MANAGEMENT INFORMATION WHICH CONTAINS RESTRICTIVE INFORMATION USING A DIFFERENT KEY IN EACH MANAGEMENT INFORMATION SEND/RECEIVE SESSION

摘要

In each of the digital data using the session, a memory card, on the other hand to generate a conversion key information for specifying a data conversion, a player generates inverse conversion key information for specifying an inverse data conversion. The memory card implementing the specified data converted by the conversion key information on management information stored therein, and sends the converted management information and digital content stored therein to the player. The player restricts the use of digital contents using the digital content according to restore the management information by executing the specified inverse data conversion by the inverse conversion key information on the converted management information, and the limit set to the restored management information.