[occz]

There's a crucial difference between intellectual property and physical property - in the case of physical property, someone else having it necessitates that you cannot have it.

Intellectual property is infinitely reproducible and someone else having it does not mean you cannot have it.

[amelius]

How does that make a difference here?

Besides, physical property law is also just an abstract concept. If _you_ own a swimming pool, who says I cannot use it also?

[occz]

One person using a swimming pool means that another person cannot use that particular fraction of the same swimming pool at the same time.

Again, this does not apply to intellectual property, which is infinitely reproducible.