Apparatus and method for receiving and decrypting encrypted data

Details Apparatus and method for receiving and decrypting encrypted data Apparatus and method for receiving and decrypting encrypted data

1997-09-02

2000-05-09

Barron, Jr., Gilberto

Cryptography

Video cryptography

Copy protection or prevention

380202, 705 58, H04N 7167

Patent

active

06061451&

ABSTRACT:
A data receiving apparatus is formed of a set top unit connected to a network and a security module. Digital video data which is supplied from the network and scrambled according to a first system is scrambled according to a second system in a scramble circuit in the set top unit, and is supplied to the security module. The data is descrambled according to the first system in a descramble circuit in the security module, and is transferred back to the set top unit. The data is descrambled according to the second system in a descramble circuit in the set top unit, and is outputted to an image display terminal via an MPEG decoder.

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patent: 5613004 (1997-03-01), Cooperman et al.
patent: 5739864 (1998-04-01), Copeland
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patent: 5757909 (1998-05-01), Park
patent: 5787171 (1998-07-01), Kubota et al.
patent: 5787179 (1998-07-01), Ogawa et al.
patent: 5923486 (1999-07-01), Sugiyama et al.

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