Patent ID: 6944297
Filing Date: 2005-09-13
Classification: G06F,G11B,H04N

Abstract:
1. A data reproducing method comprising the steps of: separating a synchronization signal from a digital signal read out from a data record medium; demodulating the digital signal separated from the synchronization signal in accordance with a pre-set demodulation system; error correction decoding the demodulated digital data; resolving the error correction decoded digital data into pre-set sectors; and separating a header part of a sector structure of the digital data resolved into sectors; wherein the input has been ciphered in at least two selected steps for recording that are each a counterpart of one of said separations demodulating, error correction decoding, header separating and resolving steps; and the input is deciphered in at least two selected stops for reproduction that are each a counterpart of one of the at least two selected steps for recording in which ciphering has occurred at the time of recording.