Compresses video decompression system with encryption of compressed data stored in video buffer
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United States of America Patent
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Mar 23, 2004
Grant Date -
N/A
app pub date -
May 19, 1999
filing date -
May 29, 1998
priority date (Note) -
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status (Latency Note)
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Abstract
A secure computing system prevents unauthorized use of compressed video data stored in a first-in-first-out memory buffer in a set top box. A single integrated circuit includes a data processor and a chip identity read only register storing a unique chip identity number fixed during manufacture. The data processor encrypts the compressed video data stream using the chip identity number as an encryption key. This encrypted data is stored in and recalled from a FIFO buffer. The data processor then decrypts the recalled data employing at least a part of the chip identity number as the decryption key. Using technique the compressed video data stream temporarily stored in compressed form in the FIFO buffer can only be employed by the particular data processor having the unique chip identity number.
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