OK. I admit it. I don't know jack about this pirate licensing stuff really. I'm dazed & confused. Let's say that there are 3 machines running Windows 8.1 Pro, all installed from clean ISO. They are all activated (KMSpico) and appear genuine. However, they all have the same product key and product ID. Now, 2 of those machines got a clearance for Windows 10 upgrade which weren't done yet. So I guess MS would know that at least 2 machines are using the same keys/IDs? Here are the questions; 1. How comes they allow upgrading of 2 machines with the same key? 2. What would happen if one would upgrade all machines that are using the same key/ID to Windows 10? 3. Is there a way to change the keys and ID's on Windows 8.1 prior to upgrading? 4. Is there a tool for "generating" and changing those? 5. Does it make any sense to change the keys/IDs? 6. I assume the licenses are retail!? There is no OEM in IDs; is this correct? 7. If one would choose to download an ISO from taskbar upgrade menu (the windows icon), could it be installed on all machines and activated?