Will the agent on the workstations stay working

We are in the middle on negotiating for a new license for a new license. I needed to know if the license laps on the Endpoint Server, will the clients on the workstations continue to work? Will they continue to receive definition updates, I understand that I won’t be able to upgrade the client and that stuff. But will they stay protected until this gets resolved, or will it all just stop working everything? What will stay up and working in the license fails before we get this resolved? I am currently running the 12.1.6318.6100. Thanks for any help.