I think it reads more generally, as in "for any purpose whatsoever except patent litigation".

I feel like (again, until clarified) it's more broad than that. "Wants to use our technology" certainly implies to me that I can seek out Tesla's patent applications and attempt to build using them.

That definitely doesn't sound right to me, because it says "wants to use our technology." That implies awareness that one is using Tesla's technology, because otherwise this promise wouldn't mean anything since people who don't believe they're using Tesla's technology wouldn't think they fall under it anyway.

I am having trouble working out what it does mean, though. Based on the rest of the article, my best guess is "Does not act in a predatory manner toward other carmakers, such as initiating patent lawsuits of their own." Basically, I think Musk is trying to say that Tesla are willing to cooperate toward the goal of making electric cars a bigger presence if you are, but they don't want people using their patents in conjunction with underhanded tactics to try and monopolize the market.