198770 ⎘
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 are linked to media defects or read/write errors wherein said defects or errors are generated on purpose, e.g. intended scratches said intentional errors occurring because of corrupted address information
CONTROLLED ACCESS DVD
#2Apparatus for and a method of copy-protecting a content carrying recording medium
#3Copy protection of optical discs
#4Copying digital content by emulating playing of a recording medium by a player
#5Method and Device For Protecting the Contents of an Information Carrier
#6Method for data storage protection and encryption
#7Optical disc including two different sets of sectors having identical IDs