SCO said that the termination of the AIX license means that all IBM Unix customers also have no license to use the software. "This termination not only applies to new business by IBM, but also existing copies of AIX that are installed at all customer sites. All of it has to be destroyed," Sontag said.

(The person quoted above is Chris Sontag, representing SCO.)

For those who haven't been following the story, SCO has filed suit against IBM, claiming that IBM allowed copyrighted UNIX source code to migrate into the Linux source base. SCO also wants licensing fees from all Linux distributors.

Last week, SCO gave IBM an ultimatum. In response, IBM essentially gave SCO the finger. Today, SCO yanked IBM's license, and in response IBM is effectively giving them the finger again.