I don't know the details, but I have read that Penrose prevailed and was able to get the company to stop using "his" kites and darts. (At least Penrose didn't try to stop other people from writing papers about his idea. As compared with Matthew Cook, who was threatened with legal action should he write a paper about his own idea.) --Dan Fred wrote: << . . . Many years ago, I wrote similarly booby-trapped recursive PostScript for Penrose kites-and-darts tilings. [This improved upon a more primitive earlier program, which had itself been regarded with such awe by the mainframe maintenance team that they used it to test the flatbed plotter.] The program achieved some notoriety when a firm of toilet-paper manufacturers employed it to decorate their product. Sir Roger Penrose was not amused, and threatened to take them to court. I have no recollection of how the case was finally resolved, but it did lead at the time to a certain amount of unkind ribaldry at his expense, in connection with some rather controversial cosmological speculation.

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_____________________________________________________________________ "It don't mean a thing if it ain't got that certain je ne sais quoi." --Peter Schickele