SCO is fighting IBM on Linux, alleging that some copyrighted software has made its way into the Linux source. Eric Raymond has a position paper, representing the Open Source Initiative:
SCO’s complaint is factually defective in that it implies claims about SCO’s business and technical capabilities that are untrue. It is, indeed, very cleverly crafted to deceive a reader without intimate knowledge of the technology and history of Unix; it gives false impressions by both the suppression of relevant facts, the ambiguous suggestion of falsehoods, and in a few instances by outright lying.