198749 ⎘
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 a digital rights management system for enforcing a usage restriction wherein the usage restriction can be expressed as a specific number wherein the usage restriction limits the number of times a program can be installed
Apparatus and method for using content on an optical disc having plural partial areas for recording control information indicating that the use of the content is not permitted
#2Methods for preventing software piracy
#3Data retrieval systems
#4Data retrieval systems
#5Apparatus for and a method of enabling copying a copy-protected recording medium
#6Copy-Protected Optical Information Carrier
#7System for binding secrets to a computer system having tolerance for hardware changes
#8Data recovery systems
#9Compact disc with new feature