[rochellle]

  ...products that have a limited lifespan and are 
  guaranteed leave the network.

So, perhaps, something like, say... a four year lifespan? And maybe they "get retired" if they fail to leave the network?

Maybe we could give them names like Roy, Zhora, Leon and Pris...

[pdkl95]

That's is more or less the model I intended. Specifically, I was referring to one of Dan Geer's extremely important recommendations in "Cybersecurity as Realpolitik"[1].

[1] https://www.youtube.com/watch?v=nT-TGvYOBpI ( http://geer.tinho.net/geer.blackhat.6viii14.txt )