SCO Group chief executive Darl McBride has attempted to nudge the Homeland Security Advisory alert back up towards Red, by accusing foreign interests of undermining US national security in a draft letter to Congressmen.

How are they doing this?

"Instead of UNIX from any number of US companies or Windows from Microsoft, governments throughout Europe and Asia are using Linux\ufffd I find this particularly galling because that Linux software contains thousands of lines of my company's proprietary UNIX code - for which we receive no revenue."