Content reading method for reading out copyright-protected content from non-transitory recording medium, content reading apparatus, and non-transitory recording medium

摘要

A content reading method includes identifying first version information indicating a version of a content copyright protection method of an optical disk based on this optical disk, identifying second version information indicating a version of a protocol used in authentication of a host apparatus, determining whether the authentication is to be approved or not by comparing the first version information and the second version information, authenticating the host apparatus according to a result of the determination, reading out, from the optical disk, Volume ID used in decrypting an encrypted content and sending it to the authenticated host apparatus, and 0 the encrypted content from the optical disk and sending it to the authenticated host apparatus.