Patent ID: 8634555

Claim:
A content providing system comprising: a server which provides to a host apparatus a first encrypted content including an encrypted area having applied thereto a replacement key; a host apparatus which receives the first encrypted content and replacement key application area information indicating the encrypted area having applied thereto the replacement key from the server; and a data storage device which receives the replacement key from the server and an individual key set in terms of content distribution processing from the server and performs key replacement processing for changing the replacement key application area of the first encrypted content to an encrypted area by the individual key to store a second encrypted content after the key replacement processing in a data recording area, wherein the server provides to the host apparatus an encrypted content in which the replacement key application area as the encrypted area having applied thereto the replacement key in the first encrypted content and a title key application area as an encrypted area having applied thereto a content-compliant title key are mixed, and the data storage device receives the replacement key, the individual key, and the title key from the server, stores the replacement key in a first protected area where access from the outside is not permitted, and stores the individual key and the title key in a second protected area where access from an authorized external apparatus is permitted.