This is an interesting idea, but I wonder how fees would be assessed? At one remove "source available, but pay for commercial use" seems very workable. The tri

This is an interesting idea, but I wonder how fees would be assessed? At one remove "source available, but pay for commercial use" seems very workable. The tricky part is handling it 3+ commercial layers out, where you're either building up a pyramid of fees or making direct payments several notches back along the chain. The first threatens to strangle commercial use past a few removes, the second might work better but opens all the "find the license holder" issues music has already. I don't mean to dismiss the idea, rather I'm interested to think through what a low-impact way of implementing this might be.