Gamasutra - a site devoted to the art and science of making games - has put up an interview with Gooseman. A taste:
Were there ever any ownership problems with the project? Who has ownership of the mod?Well, what are you waiting for? Go! Go! Go!
When we did sell the rights to Valve, it was pretty clear who had the rights to CS. Up until then, we knew who was in control: it was just me and Cliffe. When we sold it to Valve, we didn't have much of a choice because I was just graduating and I really needed to turn this into something more than just a hobby, I needed to actually make a living off it. It was a good decision, I think, on my part.