Can you actually DRM a video so that the OS won't let it be screenshotted? I usually use the snipping tool for Windows screenshots, does DRM stop that working somehow?

I don’t think it will on Linux, I could have sworn I’ve watched Netflix with just the EFI framebuffer. If that worked then there’s no way any sort of DRM that can be viewed on Linux would stop this.

Try Netflix with Microsoft Edge and try to take a screenshot. Only subtitles will be visible.

Abuse of proprietary power at it's finest.

Even if you can, it's possible to circumvent that (see: analogue loophole).