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Unity has changed its pricing model, and game developers are pissed off
(www.theverge.com)
This is a most excellent place for technology news and articles.
I read in a other thread, that they're not doing it retro actively on paper. Its part of the new terms for new licenses.
But since their licenses are perpetual and need to be renewed constantly, it will affect everyone when they hit the next cycle. Everything released afterwards is then affected. This even includes current projects in the works and even finished ones when you want to do a bug fix. That way, they seem to be "safe" to do that legally.