In order to reproduce data scrambled in respective manners to recordable recording medium, it is necessary to take the step of discriminating if the reproduction signal comes from any recording medium before descrambling the data. Further, before doing the control, it is necessary to discriminate if...http://www.google.com/patents/US6578149?utm_source=gb-gplus-sharePatent US6578149 - METHOD FOR REPRODUCING DATA, APPARATUS FOR REPRODUCING DATA, METHOD FOR CODING DATA, METHOD FOR RECORDING DATA, APPARATUS FOR RECORDING AND REPRODUCING DATA, METHOD FOR AUTHENTICATION, SEMICONDUCTOR CHIP, REPRODUCING APPARATUS, RECORDING APPARATUS AND DATA PROCESSING APPARATUS
