Apparatus for preventing illegal copying of a digital broadcasti

Details Apparatus for preventing illegal copying of a digital broadcasti Apparatus for preventing illegal copying of a digital broadcasti

1996-06-11

1998-05-26

Barron, Jr., Gilberto

Cryptography

Cryptanalysis

380 14, 380 15, 380 20, 348439, H04N 7169

Patent

active

057579105

ABSTRACT:
An apparatus for preventing illegal copying of a digital broadcasting signal, comprises a transmission section for generating a copy prevention signal to determine a display time of each field of a digital video signal on a screen, compressing the digital video signal and the copy prevention signal, modulating the compressed copy prevention signal and digital video signal into the digital broadcasting signal and transmitting the digital broadcasting signal through a transmitting antenna, and a reception section for receiving the digital broadcasting signal transmitted from the transmission section through a receiving antenna, demodulating the received digital broadcasting signal into the digital video signal, expanding the demodulated digital video signal, detecting the copy prevention signal from the expanded digital video signal, generating horizontal and vertical synchronous signals in response to the detected copy prevention signal and displaying the expanded digital video signal on the screen synchronously with the generated horizontal and vertical synchronous signals.

REFERENCES:
patent: 4594609 (1986-06-01), Romao et al.
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patent: 5113441 (1992-05-01), Hasada
patent: 5177618 (1993-01-01), Dunlap et al.
patent: 5182771 (1993-01-01), Munich et al.
patent: 5384598 (1995-01-01), Rodriguez et al.

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