You're talking about reverse engineering. This is unfair competition, plain and simple. Depending on how you view their market (general purpose devices versus g

You're talking about reverse engineering. This is unfair competition, plain and simple. Depending on how you view their market (general purpose devices versus gaming), Nvidia has a majority marketshare, with over 75% of the market for gamers. That qualifies it for a monopoly status and given this story, we could easily be talking about them violating the antitrust laws. Of course, I may be exaggerating and government interventions are rarely any good for consumers. It would be better if we, as consumers or developers, would acknowledge such abuse and punish such companies with our thoughts and wallets. So no, AMD not having access to that source-code is not OK, plus AMD shouldn't have to patch their drivers for that game, because such a practice has far reaching consequences, affecting indie game developers (Nvidia won't patch their drivers for indie games that aren't as popular as Witcher 3), or any operating system that isn't number 1 (which on the desktop means anything non-Windows).