Patent ID: 6745166
Filing Date: 2004-06-01
Classification: G06F,G11B,H04L

Abstract:
A contents information recording method for recording enciphered contents information and enciphered key information from a first medium which recorded therein the enciphered contents information enciphered with a predetermined contents key and enciphered key information obtained by enciphering the contents key with information about media ID of the first medium as an ID key into a second medium, the method comprising the steps of:recording temporarily information about the media ID of the first medium in a predetermined memory other than the first and second media, recording the enciphered contents information and the enciphered key information in the second medium, and deleting the enciphered key information from the first medium; and recording, in the second medium, independent ID information comprised of information about media ID of the second medium and media ID of the first medium recorded temporarily in the memory and deleting, from the memory, information about media ID of the first media recorded temporarily.