Let's re-check this case...
SCO sued IBM in 2003 for more than US$1 billion, alleging that IBM had misappropriated Unix technology to which SCO claimed intellectual property rights. SCO also billed a few companies for using Linux operating system, one of popular dedicated server hosting companies, Rackspace, is believed that has SCO an undisclosure amount of money in license fee..
However an email showed that there were no evidences of UNIX code at all.
SCO e-mail: No 'smoking gun' in Linux code (C|net, News.com 14.7.2005):
The e-mail, which was sent to SCO Group CEO Darl McBride by a senior vice president at the company, forwards on an e-mail from a SCO engineer. In the Aug. 13, 2002, e-mail, engineer Michael Davidson said "At the end, we had found absolutely nothing ie (sic) no evidence of any copyright infringement whatsoever."
More store:
SCO e-mail: No 'smoking gun' in Linux code (C|net, News.com 14.7.2005)
UserAgent: Mozilla/5.0 (Macintosh; U; PPC Mac OS X; en) AppleWebKit/412.6 (KHTML, like Gecko) Safari/412.2