Hi @Roy if you convert from co-term to PDL, then basically, upon converting, you will have one device per license and every individual per-device license will expire on that same day in 2023. Then, as you add new licenses, your license expiration dates will start to diverge. Suppose your current co-term date is 1/1/2023. You convert to PDLm and at first, every piece of equipment in your inventory will now be licensed individually, and expire on 1/1/2023. Then suppose next month you purchase and apply 1 AP and one LIC-ENT-1YR on July 1st, then that one single AP will have an expiration of 7/1/2021.
All that said, I would not recommend converting to PDL simply to say that you've done it or to see how it works. I would only recommend converting to PDL if there's a requirement or business reason to do so. PDL has certain benefits such as partial renewals, a 90-day initial activation window, the ability to move devices and their licenses between organizations. Note that once you convert to PDL, there is not a mechanism to revert back to co-term. However there are 1-day license SKUs that allow you to purchase the proper combination of 1-day license keys for individual devices to be able to true-up and have a shared expiration date, to re-achieve a co-term situation.
Hope that helps! Here's a couple good docs for more info:
https://documentation.meraki.com/zGeneral_Administration/Licensing/Meraki_Per-Device_Licensing_Overv...
and
https://documentation.meraki.com/zGeneral_Administration/Licensing/Meraki_Per-Device_Licensing_Overv...
and
https://documentation.meraki.com/zGeneral_Administration/Licensing/Meraki_Per-Device_Licensing_Overv...