Yes, different licenses are used. We currently have a license files for both 2004 and 2005 in FlexLM. My understanding is that if on subscription you're allow to keep older versions of AutoCAD.
My question is if all lic. files are being used, will FlexLM allow someone to open an older lic. file? My guess is that it won't. But, if it does, would that be violation of the end-user lic. agreement?
Kerry