They don't. They clarify that owning a copy of the game does not confer copyright ownership, and they outline public performance rights, but it's ownership over a physical object in the same way owning a lamp is, or perhaps more appropriately, the way in which owning a book is.

If you say that you "own a copy of Jonathan Strange & Mr. Norrell," no one crawls out of the work to argue IP and copyright law. Everyone understands what is meant.

This is no different.