Mac and PC NIS2009 version - mix and match..?

Good evening all,

 

I just purchased the NIS2009 which is allowed on 3 PC's. I suppose I have to take that literary: only for PC's, and not one on a PC and one for a Mac, because that would be 2 different programs, right?

 

Just curious, I'd love to have Norton on my Mac also but funds are a little low.

 

Regards,

Milli.