Can anyone help me to get HDCP content working with Pascal and shiki.kext? (iTunes DRM videos, etc.)

I have a GTX 1080 Ti, and I am having trouble getting HDCP content to work properly -- Amazon streaming, iTunes movies, and of course Netflix. I have tried using shiki.kext with no luck, and my iGPU is disabled.

Is anyone here experienced with this and willing to lend a hand?

Thanks in advance!