On June 12, 2010 at 19:02, Audible Solutions said...
No data is sent till source and sink communicate and authenticate each other. This is done via low speed data or DDC channel. The AVR has nothing to do here but pass this signal on to the sink. It does not look at it. It does not decode it.
The below spec is a bit dated, but unless it changed significantly (or I am misreading it) then I believe you have a misunderstanding about how the HDCP authentication works when an AVR is involved.
If the AVR is capable of accessing the encrypted audio stream, then it is behaving as an "HDCP Repeater", and as such does not simply pass authentication messages blindly back and forth. Rather, it first authenticates with the source, and then gathers information about downstream devices in order to send its own authentication messages describing those devices back to the source.
Please see page 10.
[Link: digital-cp.com]
