Is there a way within Zen to sell software licences?

eg: I have a list of (say) 10 licences for product X. I should be able to put product X into ZC with a stock level of 10, and each purchase would allow the buyer to download their (unique) licence. Obviously two purchasers would not get the same licence.

I can't see anything relevant but then my searching skills might just be no good!

If I can't do this, hints as to where to start writing a module to do it appreciated.