Instead of storing a music track (or movie) as an MP3 or MP4 file on a single server, why not break it up into a bitstream in chunks of less than a byte and distribute it amongst a large number of servers. Each file on each server would then appear to be nothing but a random bitstream bearing no relation to the actual original work.
To access/download said movie/music, all you need is the right piece of software and the key which activates a function that downloads the bitstream fragments from the relevant servers and re-orders them into the original track.
This way, no server will have a copy of the copyright-infringing material that could be recognised as the offending work so surely could not be the subject of a copyright violation.
Since the servers would be useless without the key and the key would be useless without the servers -- neither part constitutes the copyrighted work.
Yeah, it's a form of distributed encryption -- but how do copyright holders issue a takedown notice for something that is clearly not their copyrighted content?
Just a thought. Probably already been done because there's nothing new in the universe.