DRM on the audio path has been attempted since the earliest days of PC soundcards. It took the industry a little too long to work out that anyone could route a CD signal to the Record Input inside most typical PC soundcard mixer apps. Once they did work it out, that option disappeared.
DRM killed DAT as a consumer format back in the early 90s.
In fact there were DRM attempts on vinyl and tape, but it's impossible to make inaudible analog DRM, so they never caught on.
The bigger problem now is the move from files to streaming services. If you sell someone a file - downloadable or on CD, it doesn't matter - they can always torrent it.
If all music is locked inside streaming services, they can't - at least, not easily.
