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.<p>DRM killed DAT as a consumer format back in the early 90s.<p>In fact there were DRM attempts on vinyl and tape, but it&#x27;s impossible to make inaudible analog DRM, so they never caught on.<p>The bigger problem now is the move from files to streaming services. If you sell someone a file - downloadable or on CD, it doesn&#x27;t matter - they can always torrent it.<p>If all music is locked inside streaming services, they can&#x27;t - at least, not easily.