There's a real problem in the use of current technology when it comes to copies ~ they really can't be controlled short of community spies and totalitarian torture chambers.
probably be best for "artists" and their marketing buddies to figure out how to vend their stuff in a technology where copies aren't easily made.
The genie is well out of that bottle. There are semi-viable schemes to protect videos, but a sound can always be captured at the speakers regardless of the acrobatic gyrations needed to get it there.