Sony officially states that PlayStation 4 will not have DRM against used games

[osed125]

Max King of the Wild said:

osed125 said:

When the console detects the game is used, then the console simple goes to the internet temporarily for you to put a code or pay the fee directly. It's not always online, you just have to connect to activate your game, no different from online passes. 

Read op. No internet connection required. Sony never thought of it. Now stop spewing nonsense

"told reporters that any requirement for users to register a game online in order to play it would be left to game publishers"

When the console detects the game is used then it connects to the 3rd party publishers severs. Again no real difference from online passes. The only difference is that instead of multiplayer, it will be the whole game.