In the English language, "Or" can be inclusive or exclusive. While an exclusive "Or" would read as you do, an inclusive "Or" (which is most likely the intention of the developers) would read the restriction on both as occurring.
Exclusive or: "Are you going via the interstate or the back roads?" If you take the interstate, you are probably not taking the back roads. I suppose it is possibly to create a composite path that travels both, but that is not the default assumption.
Inclusive or: "Would you like any trees or bushes from our nursery?" A sales representative probably does not intend that you are locked into buying one or the other, but not both (unless it is a bad employee). The representative is asking whether you would like one, the other, or both.
In this case, I would say the inclusive "or" more clearly reflects the intentions of the developers.