Again, I think the translation barrier may have been a big part in the specific phrasing even if they were intentionally being blunt. I don't speak dutch and ca

Again, I think the translation barrier may have been a big part in the specific phrasing even if they were intentionally being blunt. I don't speak dutch and can't say definitively if that's the case, but I have spent a lot of time working with people who's first language it not english, and they can certainly come off as harsh at times when they don't mean to. In this case, it is entirely possible that "You should revise your..." was the intended meaning. I don't think that "I will not be as educational next time" is bad if one is defending a license, especially since the license is pretty clearly written and distributed with the software. There shouldn't have been a need for the maintainer to explain the problem in the first place, but since they were kind enough to do so, I think it's entirely reasonable to say that the next interaction on this topic will not be amicable (to me, that sounds like getting lawyers involved). Yes, it's very direct. Yes, it's probably a little too far toward outright dickishness. But that's their prerogative as the holders of the copyright, and they have to enforce it as they see fit. Nintendo does the same stuff and people get annoyed by it, but at the end of the day, it's their right to protect their property.