"I have the cake you don't unless you pay me" is very distinct from "You are not allowed to sing happy birthday without paying me"
One is an absolute. The cake is and moves. The other is an idea. You get rent from me expressing an Idea. Do I have to pay if I hum it inside my head? Do I have to promise not to tell anyone in written form? What if I change more than 90% of the notes but keep one theme?
I know this is a reductionist example, but IPR is like this: it has the terrible quality which goes to Patent process or patents over mathematics or physics. If you discover a specific dopant applied for a specific period of time in a specific way to silicon increases yield by 10%, Once the world knows this, why are you paid for the IPR licence time? If its to profit on the investment for research, remember that a huge amount of research is paid out of tax, not by investment returns. What if the counter parties invent a minor twist, or a related IPR moment? Yes.. people trade IPR rights, and collect IPR rights into agencies like the MP3 assciation.
This is a huge cancer on society. Its like CFDs. Its leveraging money moments out of thought.
International trade in real goods demands cheap. IPR demands rent which is "not cheap" -So the US demands for IPR rents on goods made in china, is like cutting your nose to spite your face: If you drive China to pay IPR taxes, you will drive china to seek IPR inside itself to avoid the taxes and charge YOU to copy them.
Better to have no IPR taxes than enforce payment.