Patent ID: 7181624
Filing Date: 2007-02-20
Classification: G11B

Abstract:
1. An information recorder for recording information to a recording medium, the apparatus comprising: a transport stream processing means for appending an arrival time stamp (ATS) to each of discrete transport packets included in a transport stream; and a cryptography means for generating a block key for encrypting a block data including more than one transport packet each having the appended arrival time stamp (ATS) from a block seed which is additional information unique to the block data and including the arrival time stamp (ATS), and encrypting each block data with the block key thus generated; the data encrypted by the cryptography means being recorded to the recording medium; and wherein the cryptography means generates a title-unique key from a key stored in the information recorder, disk ID and a title key unique to data to be recorded to the recording medium, and generates the block key from the title-unique key and block seed.