I just wanted to share an observation I just made. I had an old laptop that I've been using since the beta with a Digital Entitlement. In preparation to pass it on to a new owner I removed the 500GB hard drive and replaced it with a 40GB drive I had laying around. After a clean install from 1511-1 media it did not activate. I didn't have time to do a lot of experimenting so I just installed 7 and did an upgrade keeping nothing. Now it claims to have a Digital Entitlement again (but I'm not sure how good that is).