Method and system for preventing unauthorized playback of broadcasted digital data streams
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United States of America Patent
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-
Mar 4, 2003
Grant Date -
N/A
app pub date -
Jun 2, 1999
filing date -
Jul 20, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and system are provided for preventing the unauthorized playback of broadcasted digital data streams. The method includes the step of embedding a watermark in a digital data stream. The digital data stream having the embedded watermark is encrypted. The encrypted digital data stream is broadcasted with a ticket. The encrypted digital data stream and the ticket are received. The ticket is saved and the encrypted digital data stream is provided to a decryption device to decrypt the digital data stream. The decrypted digital data stream is received from the decryption device. The watermark is extracted from the decrypted digital data stream. A one-way cryptographic hashing function is applied to the saved ticket. The hashed ticket-is compared to the extracted watermark. Playback of the digital data stream is prevented, when the hashed ticket does not match the extracted watermark.
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