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    Reminiscent of the Sega “trademark security system”. Basically, the Sega Genesis / Mega Drive had a couple of features in it that would make a game unbootable unless it contained the string “SEGA” in a certain location and also wrote it to a certain register. The theory was that anyone producing unlicensed/pirated games would have to include “SEGA” in their game in order for it to be playable on Sega hardware, and then Sega could sue them for misappropriation of their trademark. However, the US courts eventually found that using a trademark in such a way was anti-competitive in a way that was basically outside of the scope of trademark.

    The same court case also touched on copyright, in deciding that copying a small amount of material for the purpose of interoperability was fair use. Unfortunately, Oracle vs. Google seems to have reversed that.