I'm sure you are aware that there are groups (scenes) which break your DRM as a hobby, they sacrifice device keys for 4K HDR content. And they do it for just the reputation.

More money than ever flows into piracy these days.

Even with complete monolithic control (which is an unlikely objective) over the entire chain from distribution to display there will be a way to obtain good quality output from a hijacked LCD controller if nothing else. There is no win condition for you.