On March 7th 2003, the SCO Group filed a lawsuit against IBM for misappropriation of tradesecrets and contractual agreements. The scope of SCOs complaint is that IBM introduced parts of Unix System V and Project Monterey into the Linux kernel. Project Monterey was a effort to port IBM's AIX 5L onto the Intel Itanium platform, IBM withdrew from that project for reasons unknown according to the press, I believe that it was because the Itanium is a bomb.