>> "It's the "activation has expired" bit that I'm curious about- I'm not sure what that means, and I'd like to be sure under which circumstances this code can be returned. "
When doing offline activations: https://wyday.com/limelm/help/offline-activation/
The activation response expires after a set period of time.
>> "We've been adding Lime to a new product recently, and I must say that it has been significantly easier to use than our previous licensing solution. We're pretty happy with Lime so far."
I'm glad to hear that. We put a lot of thought into our designs. It's gratifying to hear that our effort makes our customers' lives easier.