From what I have found digging around several sites, it appears that those disclaimers are supposed to make it easier to sue the companies feeding those copyrighted works to their databases. Currently you would have to prove that they used more than the rather vague fair use limits while the disclaimer makes any use actionable. Much like the old disclaimers about copying/storing/retrieving a work using any means whether current or yet to be invented which had a spotty record before the courts.
Whether this will actually work in a courtroom has not yet been tested.
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