NeXTSTEP and the UI thereof are thoroughly abandoned. Apple doesn't sell it anymore, last I checked (hell, I don't even think Apple acknowledges its existence at all at this point, beyond the parts that it now calls "Cocoa"). While I wouldn't put it past Apple, actually suing someone over an open-source reimplementation would be - to put it as diplomatically as possible - a dick move of the highest degree.
Legally speaking, though (as a not-lawyer), I reckon it'd be contingent on however the Oracle v. Google war goes.
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NeXTSTEP and the UI thereof are thoroughly abandoned. Apple doesn't sell it anymore, last I checked (hell, I don't even think Apple acknowledges its existence at all at this point, beyond the parts that it now calls "Cocoa"). While I wouldn't put it past Apple, actually suing someone over an open-source reimplementation would be - to put it as diplomatically as possible - a dick move of the highest degree.
Legally speaking, though (as a not-lawyer), I reckon it'd be contingent on however the Oracle v. Google war goes.