Clearing up the Autodesk rental / subscription / maintenance naming confusion

Some people are confused by Autodesk’s naming terminology about subscription, maintenance and rental. This is entirely Autodesk’s fault, because it took a name (Subscription) which had a long-established meaning (including perpetual licensing) and used that name (but without its initial capital) to mean the opposite (no perpetual licensing). There was a brief period, only last year, where the S word meant both things at the same time and differentiation between the opposing meanings was achieved using different prefixes. Confused yet? I’m not sure whether it’s kinder to view Autodesk doing something so obviously confusing as merely incompetence in communication or …