METHOD AND DEVICE FOR RECORDING ENCRYPTED DIGITAL DATA Russian patent published in 2004 - IPC

FIELD: recording scrambled data such as telecast data. SUBSTANCE: in recording digital data transferred digital information is encrypted by using record encryption key (E(NE)) and encrypted entitlement control message (ECM) obtained is saved on record medium. (E(NE)) encryption key equivalent is additionally encrypted by means of record transport key (RT(A)) to generate entitlement management message (EMM); record transport key can be generated and maintained by central authorization unit and also within decoder/recorder system of given user, for instance by generating key in recorder and transferring this version to decoder for backup storage. EFFECT: provision for scrolling record dispensing with particular decoder and for direct reproduction without decoder connection. 25 cl, 20 dwg