| 摘要 |
A video disk playback apparatus includes a disk driver which retrieves video data and a key data table from a digital video disk, and a decoder board which has its own ID. The disk driver receives the ID from the decoder board, verifies the ID, selects key data based on it, calculates a first datum from the selected key data, and sends the datum to the decoder board. The decoder board calculates a second datum from the key data and first datum, and returns the second datum to the disk driver. The disk driver verifies the second datum, produces an encryption key, encrypts the video data based on it, and feeds the encrypted video data to the decoder board. The decoder board calculates a decryption key from the first datum, decrypts the video data based on it, and decodes the decrypted video data for display.
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