Owen Smith
Well-Known Member
I've never had reason to go into the details, but was aware there is a handshake. This is effectively what I meant, I may not have expressed it well.That is not how it works.
When the sender and receiver are turned on, or a "hot plug" is detected, a HDCP negotiation is triggered which involves exchanging a cryptographic signature. Only receivers (HDMI sinks) verified as display-only are issued with signature credentials. Senders are required to implement the handshake, and as HDMI is implemented in specialist chips the handshake is built in.
If the handshake fails, or doesn't happen, the sender is not permitted to output HiDef. That's when we get the "green screen".
