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people have done that countless time with video games now adays example streets of LA=GTA ripp off

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improving on things is illegal? ithat would be like saying putting a super charger on a normal car would be illegal lol bad example

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still you dident answer its still considersd abdondware sega said it themselves

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if anything the girgin team should be happy somebody is keeping thier code still alive

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if you ask me thats why girigun emu was considersd abdondware THEY gave up on it. and plsu the name cassini wasnt just slaped on there if you actually took the time to read the cassini history you would find out that this emu was made from ground up useing girguns idea's , its kinda like how the company BASF dont make stuff they just make it better