Ah yeah you just reminded me of the rabbit hole I went down a couple years ago. Yeah I had to flash the firmware on the Anker dongle, following this guide: htt

Ah yeah you just reminded me of the rabbit hole I went down a couple years ago. Yeah I had to flash the firmware on the Anker dongle, following this guide: https://forums.macrumors.com/threads/dp-usb-c-thunderbolt-to-hdmi-2-1-4k-120hz-rgb4-4-4-10b-hdr-with-apple-silicon-m1-m4-now-possible.2381664/ https://forums.macrumors.com/threads/dp-usb-c-thunderbolt-to... I just tried streaming 4K through the Apple TV app on my M1 Macbook Pro and no issues, so I'm assuming HDCP works.