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Well zmud is independant from the mud, and therefore (much like a standalone snippet) doesn't fall under the Diku license. The same should hold true for your own client, although I suppose that depends on what sort of functionality it supports mud-side.
As an extreme example, imagine having a one-use (perhaps rechargable for a fee) "bonus magical item" button on the client which, when clicked, sent the client registration code to the mud (thus preventing people from creating their own clients to support the same functionality), which in turn spawned a nifty magical item for the player. In that case you would certainly be commercialising the mud, and just using the client as an interface.
However in general I can't see a problem - and certainly not as far as data going from the mud to the client is concerned (because that's the sort of functionality that anyone could write, without requiring access to the code for the mud). To be honest it sounds like quite a good way to make back some money from your mud.
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