Patent ID: 6993133
Filing Date: 2006-01-31
Classification: G11B

Abstract:
1. A data recording and reproduction apparatus into which a first audio data stream which has been subjected to a data conversion process for digital audio data and a second audio data stream which has not been subjected to the data conversion process for digital audio data are inputted, and which records and reproduces each inputted audio data stream, wherein the data conversion process causes the first audio data stream to become a stream which is unsuitable for watermark insertion, said apparatus comprising: a stream storage unit for storing each of the first and second audio data streams; a stream writing unit for writing each of the first and second audio data streams into said stream storage unit; and a stream reading unit for reading each audio data stream from said stream storage unit, for inserting a watermark into each read audio data stream, and for outputting a watermark-inserted audio data stream for each read audio data stream; said stream writing unit comprising