raffe writes "From Groklaw: IP Innovation LLC has just filed a patent infringement They claim against Red Hat and Novell. It was filed October 9, case no. 2:2007cv00447, IP Innovation, LLC et al v. Red Hat Inc. et al, in Texas. You might recall the patent was used in litigation against Apple in April 2007, and Beta News reported at the time that it's a 1991 Xerox PARC patent. But ars technica provided the detail that it references earlier patents going back to 1984 claim to have the rights to U.S. Patent No. 5,072,412 for a User Interface with Multiple Workspaces for Sharing Display System Objects issued Dec. 10, 1991 along with two other similar patents. So in July one Microsoft executive arrives; then as of October 1, there is the second, a patent guy. October 9, IP Innovation, a subsidiary, sues Red Hat. And Novell. So much for being Microsoft's little buddy. I think SCO II has arrived"