I tend to think is neither of those, but meant very literally. For that reason I like it and I think it's an interesting subject.
What is ownership after all? The universe does not seem to have any form of ownership embedded in it's fundamental laws. If ownership is a human construct, then it is only meaningful insofar as a group of humans agrees on it.
I can stroll up to the White House and declare that I own it, but I'll struggle to convince a sufficient number of other people that this is true. If I can't assert my ownership, then I don't really own it, do I? It doesn't matter whether it is just, or fair (again - purely human constructs), ownership only matters if it can be enforced.
Being a human construct, it is also by definition temporary. It is only valid as long as humans are around to enforce it, and humans are fleeting. Humanity might endure, but there's no reason to think we are going to be around for eternity.
So it looks like ownership is not only temporary, but it is also fickle. People routinely disagree on ownership and are willing to kill- or be-killed for asserting their claims.
It looks like neither the communists, nor the liberatarians are in the right. Things will be owned by whoever has more pointy sticks :D