| 摘要 |
<p>A digital video recorder (DVR) is disclosed comprising a unique ID, host circuitry, a hard disk drive (HDD) (item 10) for storing encrypted video programs and an encrypted file system, the encrypted file system comprising encrypted file system entries for decrypting the video programs. The host circuitry (item 28) comprises a cryptography facility for encrypting plaintext file system entries into the encrypted file system entries stored on the HDD, and for decrypting the encrypted file system entries read from the HDD into plaintext file system entries. The cryptography facility (item 14) is responsive to the unique ID for generating a pseudo-random sequence. The encoder (item 24) combines the pseudo-random sequence with the plaintext file system entries to generate the encrypted file system entries. The decoder (item 26) combines the pseudo-random sequence with the encrypted file system entries to generate the plaintext file system entries.</p> |
