To expand a little on this.
A product of the intellect can never be property, in the sense that it is not a tangible thing.
At most, information can be hidden or restricted in some sense, but eventually it will either be completely lost, or be completely free.
Think of it like water in the wilderness, always flowing to the sea.
We humans can pick it up, bottle it, sell it, etc. etc, but eventually it will return to nature, and water is a lot more tangible than some idea someone thought up, or some arrangement of bits in a computer.
So, as long as people are trying to restrict the free flow of knowledge/ideas, other people will pirate and copy and do whatever they can get away with.
This is how it is.