What is SCO playing at?

“In an escalating legal battle, the SCO Group announced yesterday that it was revoking I.B.M.’s license for software essential to a multibillion-dollar business and that it had asked a federal court to block that business permanently.

The SCO action focused on the license for AIX, the I.B.M. version of the Unix operating system. But the legal dispute is stirring wider concerns in the computer industry because it has the potential to affect the many corporations now using the GNU Linux operating system, a close relative of Unix….”[NYT report.]