You would have to ask them that, however the impression I always got was that it was some arrangement while they were students (perhaps something to do with not using educational resources for commercial purposes?) - certainly their University never seems to have claimed the copyright to DikuMUD, and as the copyright holders they are perfectly entitled to do whatever they wish with their own IP. Furthermore, I am not even certain whether Diku II is actually based on the original Diku code, or just inspired by it.
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