198727 ⎘
Signal processing not specific to the method of recording or reproducing; Circuits therefor; Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which change the format of the recording medium said format change concerning the logical format of the recording medium, e.g. the structure of sectors, blocks, or frames wherein the modification to the logical format directly concerns user data
Method for copy protection
#2Disk-shaped record medium and producing method for same, disk recording method and device, and disk playback method and device
#3Method for data storage protection and encryption
#4Copy protected DVD disc and method for producing and validating same
#5Method and apparatus for ciphering playback mode information for recording on record medium