Digital signal processing apparatus, digital signal processing method, information center, and data delivery system

摘要

Disclosed herein are a digital signal processing apparatus, a digital signal processing method, an information center, and a data delivery system capable of judging reliably whether digital signals such as music data recorded on a storage medium have been legally purchased by a customer from a legitimate vendor so that only when the digital signals are judged to be legitimately purchased data will a new service be offered to the customer.