L1 DRM requires a secured channel all the way from the app layer to the hardware. No DRM vendor is going to offer their solution on something like Linux. You can't even watch Netflix in 4K in a browser - it's only available on secured dedicated video playback devices or directly in TVs.
You can watch 4K Netflix in Edge, which I would call browser.
But the point still stands, only works with supported hardware and proprietary software.