SCO decided to go on, and annonced yesterday that they "terminated IBM's right to use AIX in their business, development, distribution and sales"

What amazes me is that the offending portions of code contains JFS, RCU, and NUMA:

JFS (Journaled File System) was created by IBM for AIX.

RCU (Read-Copy Update) was created by Sequent for Dynix/ptx system. Sequent was acquired by IBM in 1999.

NUMA (Non-Uniform Memory Access) was also acquired from Sequent, although others implementations were previously created by SGI and others.

None of these technologies were part of the original System V code, but the real claim against IBM is not copyright related; tt is about a breach of contract:

SCO claims that "IBM's 1985 Unix license, originally signed with AT&T, but subsequently transferred to SCO, prevents IBM from distributing software derived from the Unix code base."

They have a very broad vision of the derived term, IMHO ;-)