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Your responce does not explain why I can watch Netflix 4K Ultra HD content with Windows 10 Edge Browser without the 7th Gen CPU.
Because KabyLake is oficially no longer needed. Nvidia added support for Netflix in new drivers a while ago (you may google it). UHD BD playback requirements are still valid, probably bacause the studios want to protect their movies. Nvidia/AMD must make their GPUs compatible with the secure environment first.
If some Quadro model(s) is/are able to playback UHD BDs as JMX247 says, it may be an unintentional flaw in the system; these are definitely not supposed to do so.
You can also check the link below, I started the thread when Pioneer released the first drive and since then people posted lots of info on this subject there...
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FOR THE LIST OF ULTRA HD BLU-RAY COMPATIBLE MOTHERBOARDS CLICK HERE
My hardware: Aorus Z270X Gaming 8 motherboard + i7 7700 CPU + Pioneer BDR-S11J-BK