Method and apparatus for recording of encrypted digital data

摘要

A method of recording transmitted digital data in which transmitted digital information CW 96 is encrypted 97 using a recording encryption key E(NE) 98 and the resulting encrypted ECM message 99 stored on recording support medium. An equivalent of the recording encryption key E(NE) 100 is further encrypted by a recording transport key RT(A) 102 to form an EMM message 103 stored on the support medium together with the encrypted ECM message 99.