SCO Code?
For those who don't get news from outside their aggregator anymore...
“Sontag also said thousands of lines of Unix have made their way into Linux in the form of derivative works that should have been bound by SCO licensing agreements that require licensees to keep the code secret. The company said several enterprise features of Linux--the NUMA (nonuniform memory access), RCU (read-copy update), SMP (symmetrical multiprocessing), schedulers, JFS (journal file system) and XFS (extended file system) portions--all include copied code. The company broke out the number of lines of code that had been directly copied from each. It said, for example, that more than 829,000 lines of SMP code had been duplicated in Linux”
[ZDNET]