Patent ID: 7434055
Filing Date: 2008-10-07
Classification: G06T,G11B

Abstract:
1. A recording medium in which a plurality of management information are embedded and recorded into content data in a plurality of forms of different remaining intensities, the plurality of forms of different remaining intensity comprising a watermark of strong remaining intensity and a watermark of weak remaining intensity, wherein management information written into the watermark of the strong remaining intensity is more severe than the management information written into the watermark of the weaker remaining intensity, wherein said management information in the watermark of the strong remaining intensity remains even if a signal process is executed to the content data and said management information in the watermark of the weak remaining intensity is erased by executing a signal process to the content data; the watermark of strong remaining intensity being less likely than the watermark of weak remaining intensity to be altered by processing of the content data; and wherein the management information in the watermark of the weak remaining intensity comprises an International Standard Recording Code (ISRC).