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HDCP detection in ADV7842

The ADV7842 can indicate if the input is encrypted or not.

This can be read back in the HDMI Map

Register 0x05[6] - Content encrypted. 

Register 0x04 [4] – HDCP Key Error ( this will be set if for example when using a non- HDCP part ,and trying to establish authentication).

From my experience, It is very common for DVD players to encrypt the link regardless if the content needs protection or not.

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