Linus doesn't sound too concerned.

Q: How about the history of Unix itself. Is it hard to follow?

A: There was a lawsuit between AT&T and Berkeley. AT&T sued UC Berkeley for copyright infringement because the Berkeley version of Unix was made available openly with the Berkeley license. It took a few years but it was shown that it wasn't Berkeley that stole code from AT&T but it was AT&T that stole code from Berkeley, removed Berkeley copyrights, and they ended up settling out of court. So there is no judge that has said so officially but it was believed that Berkeley had done nothing wrong. This is the same code at issue. In that case, there was a clear genetic continuation. Now SCO is trying to use the same code that already failed a test once and to apply it to something where there isn't the same genetic continuation.

What, me worry? He goes on to talk about a great many other things related to Linux. Nice interview.