The fun thing about IBM's JFS as available in the Linux kernel was that the JFS code IBM contributed to Linux didn't in fact have anything to do with the JFS code in AIX (which SCO claimed was a derived work of Unix).
The Linux JFS code is a port of the reimplementation from scratch of JFS that IBM did for OS/2, so it couldn't have been »infected« with SCO-owned code because it never actually came in contact with any.
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