I've been using GPL software, and reverse engineering for years (manuals with more than an int13 reference used to be hard to get hold of) and have just stumbled onto an interesting link.
In the US there a process called 'Abstraction, Filtration, Comparison' that is used to determine if a work falls under the copyright of another work.
It doesn't look like anything that affects wine, but interesting anyway.
http://digital-law-online.info/lpdi1.0/treatise22.html
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