Jack Tretton–in a somewhat humorous fashion– has confirmed that the PS4 won’t have any used game’s restrictions.
To clarify, Disc-based games don’t need to be connected online to play. PlayStation 4 won’t require you to check in online periodically. And it won’t stop working if you haven’t authenticated within 24 hours.
Watch an in-depth instructional video on sharing games on the PS4 below.
Additionally, Sony seems to be following Microsoft’s model of placing a game’s multiplayer component behind their premium subscription service.