[Nel] Licensing Issue

[James Sanders]

Hello,
    I have a question. Lets say I wrote a killer MMPOG with Nel and I 
became a hit, not that that would happen, just hypothetically :). Now, 
because this isn't a perfect world, what keeps a user from just recompiling 
the code with for instance wireframing enabled to give himself an unfair 
advantage over the other users. This is a real possibility with GPL. My 
question is, are there any alternative licenses available? E.g., pay or 
profit sharing in return for a closed source license. Just wondering.

Thanks,
James

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