Let me sing you a song about frivolous claims. May I? Lookee here [PDF], will you? It's a PDF on Caldera's own web site, a paper titled JFS for Linux, by IBM's Steve Best, dated February 2002, as you can see by the url. It's copyrighted 2002, too. I will assume for the sake of my song that Caldera knew what it was doing, read the paper, and agreed with its facts and wanted the world to read it, presumably since 2002.