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[Disiciple]

Hello, I am wondering about a ambitous concept; would it be at all possible to actually rewrite the engine for the game using the D20 system for DND?  Is that Illegal?  If not how could I go about doing that?  If not, give a explanation of somekind. 

Any feedback would be great.  I am not sure as to if the game toolset can modify the engine of the game.  That's why I am asking.