I just discover something interesting on PS4, maybe its something already known but I want to share it. I bought a game online and ask for a refund, the game was already installed. Once the refund was done the game still appear in my list of games installed with no lock. I just try to start it, I got the message that I need to purchase it and it become locked. That mean the concept of locking is not implemented into the pkg but it is something verified online ? I should have check if the game would be run if I was offline ?