SCOs IP Chart?

SCO publishes a chart of the Unix IP as they see it:

   http://www.sco.com/scosource/unixtree/unixhistory01.html

The interesting thing here is that they show at least two
arrows from linux to UnixWare and no arrows going the
other direction.

So this chart shows that something from linux 2.2.16 and something
from linux 2.4.0 test1 was contributed to UnixWare. I'm wondering how
this was done considering the terms of the GPL?


-- 
Greg Wilkins<gregw@mortbay.com>             Phone/fax: +44 7092063462
Mort Bay Consulting Australia and UK.          http://www.mortbay.com