This whole story about SCO lately is fairly frightening if you ask me. They are suing IBM for $1 billion, claiming that the Unix technology that IBM licensed from them was then ripped off and copied into the open-source Linux operating system. It may not be a problem for just IBM however, because they are also hinting at going after users of the Linux OS.
From the Q&A with SCO GM:
What about SuSE and Red Hat customers and other Linux users? Could they face litigation or be affected in any way? Certainly, as the evidence mounts, there could be concerns and issues for end customers. When you’re talking about copyrighted materials or trade secrets being inappropriately obtained and released, even the recipients of that information have to have concerns.