I've read its DRM related several times, so it's simply built into the actual connector/software to limit number of connections....interesting. Thanks.
ps Of course the connector/software limitations are a sort of DRM on second thought. It is relevant for audio, tho as I need to supplement hdmi connection with analog....
I'm kind of explaining things wrong.
HDMI is all digital, and to carry audio, it must also carry video. So, in receivers, that often only have one video output, to get audio from HDMI to a secondary zone, there must be two video decoders. Plus, since that second zone is also stereo, they must have a full suite of surround sound processors for both the main zone and the secondary zone.
This is why analog audio connections really must be used for the secondary zone. It is also why most receivers downgrade audio to stereo when the secondary zone is playing audio to it from the main zone at the same time.
HDCP (DRM) can play a part in distribution, but it is not DRM which is impacting this scenario. It's actually the audio encoding itself and the lack of functionality of most A/V receivers. A three zone A/V receiver, with multi-zone DSP capabilities, could actually take all the sources in over HDMI, then process the surround sound mix down to stereo for zones 2 and 3 independently of the main zone. They also could pay licensing rights to HDMI.org for the use of zone 2 and 3 as authorized receiving points for audio/video regardless of the keys authenticated from the original source. So, it would not bypass HDCP, but authorize HDCP for as many destinations as are available.
To my knowledge, not a single A/V receiver on the face of the earth does this.
So, you have to hook up analog audio, if it is available.
In my case, I use a 16x16 HDMI switcher with integrated DSP. So, every HDMI input I have has an available analog audio output to it which I can feed to my distributed audio system separately and without the need for an additional product. It retains HD audio codecs while giving me usable stereo audio at the same time. It also authenticates HDCP across all 16 outputs so I can simultaneously watch the same Blu-ray Disc or cable TV show on up to 16 displays at once.