In response to post #36057730. #36372180, #45380525 are all replies on the same post. Game Engines are the dynamic cores of games. The physics and graphical engines are, like a book, owned as copyright by the programmers who built them or the companies they worked for. TES Renewal DOES NOT re-write the core engines of the games. Think of it this way: I pimp up your car but it is still YOUR ENGINE, that you purchased from your own work. So, without the base engines, Skywind and Skyblivion would not exist. On the other hand, Policy is like medicinal alcohol in hospitals. Medicinal spirit, requires at least 2 minutes of continuous contact to kill mere weak bacteria, and does nothing to some tough fubgi or a few viruses. Why still use it, then ? Best policy system. It is a safer bet to use some disinfectant, albeit half-effective, than none at all. Same way, the safer way is to collaborate with Bethesda, rather than be at odds. Bethesda has the legal power to strip Skywind of everything Elder Scrolls related since it owns copyright. Both sides are being diplomatic, TES Renewal sleeps peacefully at night and Bethesda makes more money. Wars are only good in video-games. Now, why own a bethesda product to play an expansion on it ? Lion's share, as simple as that. But think lf it this way, wouldn't YOU have the same position if you put in the amount of work both Bethesda teams put in these games ?