That's already a thing, so I'm not sure what you're referring to or asking.

Video can be encrypted with DRM, and only play on devices with DRM module or decryption.

When you can play and see the video on your screen, through your web browser or media player, and then stream your desktop to a TV, you may not be able to see the video if it's DRM protected against that.

YouTube already used DRM for many years, but only on select videos. Youtube-dl was criticized and attacked for having decryption code and test cases / explicitly referenced protected videos/video URLs, effectively meaning promoting or instructing DRM circumvention, which is illegal in many jurisdictions (moreso than downloading or playing unprotected media).

That's why yt-dlp (fork of youtube-dl) does not include that DRM decryption - AFIK anyway.

The main webbrowsers include DRM related stuff to be able to play them back. Those who want to ship their own have this additional barrier to reach feature parity. And distributors or operating systems like Debian that want to distribute only free code can't include them.

This is from the top of my head. So excuse me if anything is wrong or overly broad.