Patent ID: 6728379
Filing Date: 2004-04-27
Classification: H04L,H04N

Abstract:
An information processor comprising:means for receiving an encrypted content decryption key generated by encrypting a content decryption key for decryption of a content data encrypted by a content encryption key and a copy control code added to the content decryption key; means for decrypting the received encrypted content decryption key and the copy control code added to the content decryption key; means for generating a renewed copy control code in accordance with the copy control code added to the content decryption key; means for adding the renewed copy control code to the decrypted content decryption key and encrypting the content decryption key decrypted by the decrypting means and the renewed copy control code added to the content decryption key with an encryption key which can be decrypted at an external apparatus; and means for transmitting to the external apparatus the content decryption key encrypted by the encrypting means and the encrypted renewed copy control code encrypted by the encrypting means.