| 摘要 |
The method is for encrypting media signals in a safe manner to prevent unauthorized copying and distribution of digital media signals. A computer system (12) sends a retrieval signal (29) to a system (14, 16) to retrieve a media signal (30). The system (14, (16) encrypts the media signal (30) to an encrypted file (31) and creates a encryption key (38) and a decryption key (40) associated with the file (31). The system (14, (16) sends the file (31) and the encryption key (38) to the system (12) that sends a request signal. (48) the system (14, (16) to identify the decryption key (40). The encryption key (38) is used to gain access to session keys (60) of the decryption key (40) that are sent to the system (12) to decrypt the file (31). |
