> I think the main feature of property is to disallow others from using it in a way that restricts your own use. For IP, others selling copies would restrict your ability to sell copies as they undercut you.

The main difference between the wheelbarrow and IP lies in the copies. If someone else uses my wheelbarrow I can't use it while they're using it, or they may damage it. If someone copies an mp3 of a song I performed, I still have my mp3.

We had a working economic model based on physical property and we've been crippling the wonderful ability to infinitely create zero-cost copies of digital artifacts in order to fit our existing model. It's not horrendous that we've done this, and I'd optimistically view it as a step on the road to something yet unrealized.

> medical data

That deals with privacy, which is a different can of worms.