Television receiver and electronic device

Details Television receiver and electronic device Television receiver and electronic device

2005-02-04

2009-08-04

LaForgia, Christian (Department: 2439)

Information security

Protection of hardware

C726S035000, C725S025000, C725S026000, C713S194000

Reexamination Certificate

active

07571491

ABSTRACT:
In a television receiver having a decryption unit and a video display unit which are stored in one casing, copyright protection is given to an encrypted digital video signal or analog video signal.When an encrypted digital video signal is inputted to a digital video signal input terminal, the signal is decrypted by a decoding circuit to obtain an after-decryption video signal that is copiable, and thereafter, the signal is visualized by a video display unit. When a casing cover is opened, a decoding control circuit converts a parameter that is needed for decryption, such as an encryption key, into a meaningless parameter, and outputs it to the decoding circuit, whereby the after-decryption video signal becomes a video signal that is not decrypted.On the other hand, during maintenance, a predetermined code is inputted from a button group (18) to output a regular decryption parameter to the decoding circuit (13).

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