Debatable - people who make money from Diku muds are unlikely to pay for the commercial DikuII licence, are they? And even if that weren't the case, they could still claim .
However as I've already pointed out, the Diku licence is not a contract. All it does is give you permission to do things which would otherwise be prohibited by copyright law.
No, it wouldn't - it would simply take away everyone's right to copy, modify, distribute, derived from and display works based upon DikuMUD. The licence is the only thing giving those rights, so if you removed it you would also remove those rights.
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