| 摘要 |
<p>A method for transmission and recording of encrypted information (Ce), in which the information (Ce) is encrypted by a first key and transmitted in encrypted form, the encrypted information (Ce) being received by a decoder (2020) possessing an equivalent of the first key necessary to decrypt the information and characterised in that the decrypted information (Ce) is re-encrypted by means of a second key (C2) stored in a portable support device (4004) adapted to be received by the decoder (2020) and/or digital recording device (4005), the re-encrypted information being thereafter recorded on the digital recording medium (4006). When replaying the recording, the information is decrypted by means of the second key (C2) stored on the support means (4004). In a particularly preferred embodiment, the information (Ce) corresponds to a control word used to scramble and descramble transmitted data, the re-encrypted control word (Ce) being stored on the recording medium (4006) together with the still scrambled transmitted data.</p> |
