Here is an article that is just perfect.

It's worth remembering that there is a court case about these very issues, involving a set of anti-Linux lawsuits brought by SCO Corp...Three years and endless depositions later, there still isn't a single credible example of an IP problem with Linux.

Why is Novell complicit in this FUDmongering? Oh, yeah. $orry. Microsoft's patent attorney would not specify if Linux was infringing in any way, stating they would rather "license than litigate".

Sneaking stolen code into Linux without anyone noticing would be as easy as driving the space shuttle down Fifth Avenue at noon without turning heads.