One account. Every RFBZ product.
Your licence keys live on your account, so a new PC or a fresh install does not mean starting over. Sign in and what you own is there.
A key is only attached once this server has validated it — pasting
someone else's key does nothing.
The app signs in with the same account, so the products you own
appear there without typing anything again.
Keys are checked on every launch. A revoked key stops working
everywhere at once.