Better examples might be the derivatives of Shakespeare's work in modern times to create new art; i.e. Rosencrantz and Guildenstern Are Dead, or even Hamlet II. Of course, this is centuries later, but if copyright keeps getting extended such works may never be made in the future. One could point to the League of Extraordinary Gentleman, I suppose, for a more recent example. Or Peter Pan, after some controversy, has now been established to be in the public domain.
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