How would you distinguish a performance based on the public-domain Bach-Gesselshaft Ausgabe from one from a different score? Also I don't think Sony prints editions of classical texts.
<rant>I'm getting to the crotchety old man stance of - drop copyrights, drop patents, everyone gets paid for [a live performance|first sale of a physical object] and screw all this secondary income bullshit. None of it makes sense and it leaves too many openings for pirates/scumbags/greed to suck money out of the public. </rant>
The alternative is just to ignore it all, and use adequate OPSEC to avoid prosecution. If the system is so totally dominated by monied interests that there's no hope for relief, what else can we do? Just declare independence, and let them pound sand. China and Russia have at times done that, more or less. And we can create our own overlay Internet that can't be coerced or taken down. Or at least, can't be taken down without unacceptable consequences for the commercial Internet. If it comes down to it, overlay routers can spread as malware, and use covert channels, hidden in HD video etc.