Patent ID: 8332950

Claim:
A method of manufacturing a disc configured to store encrypted content, the method comprising: (a) generating a product mark which is used to generate a key applied to decryption of the encrypted content, the product mark: (i) including a public key certificate corresponding to a disc manufacturing entity or disc manufacturing equipment; and (ii) containing identification information for a disc manufacturing entity or disc manufacturing equipment; (b) using the generated product mark, generating a product-mark-associated value; (c) using the generated product-mark-associated value and a volume identifier, generating a computation result, the volume identifier being set with respect to a given set of discs to be manufactured; (d) generating an encrypted volume identifier by encrypting the computation result, the encryption volume identifier being used to generate said key applied to decryption of the encrypted content; and (e) recording the product mark and the encrypted volume identifier onto each individual disc, at least one of the product mark and the encrypted volume identifier being recorded by a reflective-film-removal recording method that selectively etches a reflective film from lands that have been previously formed on each individual disc, wherein the reflective-film-removal recording method causes the lands with the etched reflective film to be interpreted as values of ‘0’ by a data reading information process apparatus and interpreted as values of ‘1’ by a transfer device that physically copies discs.