SCO's lawsuit against IBM expanded from $3B to $5B this week, through the addition of copyright infringement claims.

It appears that most of the new claims come from IBM's sale of their AIX operating system after the folks at SCO told them they were no longer licensed this summer. An article in InfoWorld gives some preliminary details (copies of the filings were not yet available) based on someone "close to the case").

In related news, both sides are still arguing about discovery... apparently we're not supposed to know what the original infringing information is.