8K content is protected by heavy Digital Rights Management (DRM).
Unlike the early days of DVD, where "region-free codes" could be entered via a remote control to unlock a player, modern 8K hardware is locked down tight. 8k player codes
If your monitor isn't 8K, ensure your player is using a high-quality "downsampler" like MadVR to maintain clarity without crashing. 8K content is protected by heavy Digital Rights