I found this web page somehow while searching MyZemax, and can't find it to get there again with any searches, so I thought I would share it with everybody:
https://my.zemax.com/en-US/Licensing-Policies/subscription-faq/
Note that this is NOT the same page found at (MyZemax) Home > Licensing > Subscription , and as far as I can tell, you can't find it as a tab or link within any of those pages, either:
It has lots of good information on license policies in general, pricing, keys, and migration from Perpetual to Subscription versions, which I have been considering (although still don't fully understand). I'm assuing that it's correct and that Zemax wants people to know this information!
-- Greg