Not necessarily; it would break the current EULA model, which I don't particularly like or agree with. It would require a modification, say, have the developers (who now own their IP and therefore its copyright) allocate the individual end-user identification according to however they want, e.g. act as a broker between seller and purchaser ...
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You're right, but that sounds like a pain; doing the work of the publisher, the retailer and the developer. Maybe I'm not following your concepts close enough?