METHOD FOR SCRAMBLING AND DESCRAMBLING CONTENTS DATA, ENCODER, RECORDING MEDIUM, DISTRIBUTION METHOD AND USER TERMINAL

摘要

PROBLEM TO BE SOLVED: To prevent a scramble code from being recognized in the absence of audio data in a distribution system of contents data including the audio data. SOLUTION: An EX-OR circuit 2 exclusively ORs audio data with a PN code generated based on a player ID for a voiced period in an encoder 43A so as to scramble the audio data and a DVD audio formatting circuit 8 selects an output signal of a through-path for a non-voice period or a period close thereto. An EX-OR circuit 13 of a descrambler side exclusively ORs the audio data scrambled for a voice period with the PN code to descramble the audio data, and an output signal of the through-path for a non-voice period or a period close thereto is selected.