METHOD FOR PRE-PROCESSING DIGITAL DATA, AND DIGITAL-TO-ANALOG AND ANALOG-TO-DIGITAL CONVERSION APPARATUS

摘要

PROBLEM TO BE SOLVED: To prevent an encryption scheme from being weakened by preview data and full data. SOLUTION: In a method for pre-processing digital data including digital video and/or digital audio data, a step of encoding (S3) a primary data stream (D1), a step of encrypting (S4) an encoded primary data stream (ED1) and a process of generating (P3) a preview data stream (PD) are built in and/or embedded within a common process (P2) of encoding the primary data stream (D1) in particular by integrating these processes and/or steps within a single and common encoder. COPYRIGHT: (C)2005,JPO&NCIPI