Device having a digital interface and a network system using suc

Details Device having a digital interface and a network system using suc Device having a digital interface and a network system using suc

1999-02-05

2000-09-12

Cangialosi, Salvatore

Cryptography

Video cryptography

Copy protection or prevention

380204, H04N 7167

Patent

active

061188719

ABSTRACT:
A copy flag detecting circuit in a device detects the copy generation management information. This copy generation management information is inserted in the CIP header of the IEEE 1394 packet for transmission. The copy flag detector of the 1394 interface in the device detects the copy generation management information in the CIP header. According to the detection result, the copy generation managing circuit records new copy generation management information and the recording controlling circuit permits or prohibits recording. Thus, there is no need for a decoding circuit at a receiving device.

REFERENCES:
patent: 5778064 (1998-07-01), Kori et al.
patent: 5987126 (1999-11-01), Okuyama et al.

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