Yesterday, Sigma was accused of stealing GPL'd code for it's product, and today they're opening up the source for the alleged product. This is very interesting, it's the first time I can remember where somebody put thier code under the GPL after violating it. Now, the only thing that disappoints me is that I would like to see how the GPL fares in court, I think the legal scrutiny would provide for some fascinating, as yet undiscovered, insights into copyright.