Radio transceiver or other encryption device having secure...

Random bit mask generation for obscuring data on nonvolatile...

Read- and write-access control circuits for decryption-key...

Read/write media key block

Receiving device for securely storing a content item, and...

Record carrier comprising encryption indication information

Record medium, recording apparatus for record medium,...

Recordable storage medium with protected data area

Recording and/or playback apparatus and method

Recording apparatus and method

Recording apparatus, medium, method, and related computer...

Recording apparatus, recording medium, playback apparatus,...

Recording device

Recording medium cartridge and a recording-and-reproducing...

Recording medium containing copyright information, recording...

Recording medium having encrypted sound data recorded...

Recording medium with copy protection information formed in...

Recording medium, apparatus for decrypting data and method...

Recording medium, data recording method and apparatus, data...

Recording medium, recording and/or reproducing method for...