The discussion above is not about formal definition, but about common perception. Common perception of buying is getting full ownership. All other cases are far less common.
In general, the whole notion of attempting renting the content obscuring it as a sale is not a honest way of doing things. And using DRM to enforce those rental limitations makes it even worse, since it uses unethical preemptive policing methods to do it.
In general, the whole notion of attempting renting the content obscuring it as a sale is not a honest way of doing things. And using DRM to enforce those rental limitations makes it even worse, since it uses unethical preemptive policing methods to do it.