Patent ID: 7116893
Filing Date: 2006-10-03
Classification: G11B,H04N

Abstract:
1. A data recording/reproducing apparatus comprising: recording means for recording compressed bit stream data into a recording medium, said recording means recording a compliant information for indicating that said recording means is a compliant device when said recording means records data into said recording medium; reproducing means for reproducing compressed bit stream data from the recording medium; authentication means, for determining whether the data exchange between transmitting and receiving ends transmitting and receiving said compressed bit stream data is permitted or not, said bit stream data and data accompanying said mutual compressed data being exchanged after ascertaining establishment of mutual authentication; first detecting means for detecting a watermark information is embedded in said bit stream data; renewal means for making a renewal of said watermark information in said bit stream data; and second detection means for detecting whether the recording means which recorded data in the recording medium is a compliant device or not at reproducing of said recording medium.