公开(公告)号：DE69940365D1

公开(公告)日：2009-03-19

申请号：DE69940365

申请日：1999-10-07

Applicant: PANASONIC CORP

Inventor： TAGAWA KENJI ,  MINAMI MASATAKA ,  KOZUKA MASAYUKI ,  AOYAMA SHOICHI ,  TOKUDA KATSUMI ,  HIRATA NOBORU

IPC: G11B20/10 ,  G06F1/00 ,  G11B20/00 ,  H04N5/913 ,  H04N7/167 ,  H04N7/26

Abstract: A recording medium stores a retail content and a superdistribution content that is encrypted according to a block cryptosystem. A superdistribution header is attached to the superdistribution content and encrypted according to a public key cryptosystem. The superdistribution header contains a decryption key used to decrypt the block cryptosystem. The public key cryptosystem is characterized by using a device connected to a communication network for decryption. The decryption is performed when the recording medium is loaded into the device with a fee being charged via the communication network.