I haven't actually studied what BSA has to say about this, but the answer is that again it depends a bit.. we do use licensing, but, depending on the product, it should really be seen more as a way to avoid buy-once/use-many. There's also time-limited licensing (often as a way for the customer to test stuff, or sometimes just to be able to run the software on one or more extra computers temporarily) - sometimes the temp licenses are at no extra cost. Then there are 'permanent' lincenses, which for all practical purposes means 'you bought the software. It's yours, although you still cannot use it on more than one computer at the time.'

I could go on with details but that's probably too much detail for this forum! :-)