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SCO Sues AutoZone, Readies Suit Against DaimlerChrysler: Page 3 of 3

SCO's claims have led to a legal tangle, which started last year with SCO's suit against IBM, claiming the latter company violated its Unix license by inserting some of SCO' copyrighted code into Linux.

SCO's Linux claims are also the basis for its suit against Provo, Utah-based Novell Inc., which sold the Unix System 5 code to SCO in 1995, when SCO went by the name of Caldera. Novell has claimed SCO doesn't have the right to demand licensing fees.

Red Hat Inc., the top Linux seller, also has challenged SCO's claims in its own suit against the software maker.