This code isn't that parts that SCO are trying to sue IBM about. SCO say that IBM have broken their UNIX source contract by adding SMP, RCU and NUMA from the Sequent code into Linux. They say that IBM have no right to do that as some obscure clause in an addendum gives SCO some rights over it.

The code in the slides however was committed by somebody at SGI and isn't anything to do with IBM from what I gather.

IANAL so could be wrong