Hi, I need help finding out how many installations I have on my network!

Hello, I am the SCCM Site admin. There are several VLK's for Acrobat floating around, hence several different installs of AA9. I need to find out how many installs of 1 specific VLK there are out there. The owner's are concerened they might be coming close to thier install limit and don't want to go over. I really don't know what else I could scan for but the lisense key. I know that sounds shady, but its the only unique identifier I can think of that ties these installations together.

Does anyone know how I might be able to scan for this lisense key information?? Or have any other ideas I can scan for on my network? Is there a tool that perhaps Adobe uses to find out how many VLK's are being used? Surely they must have a way of verifying a company is only using X number of installs and not going over?? Any help is greatly appreciated