With Microsoft limiting second-hand game sales with its Xbox One, Sony decided to mock Microsoft by showing off how simple it is to trade games with friend if you have a PlayStation 4. Sony promises the console will not require you to check-in online when you have a disc-based game, in fact, the console doesn't even need to be connected to the Internet.
Sony has just announced at their E3 2013 press conference that the PlayStation 4 will be friendly towards used games. The company will not impose any restrictions on what you can do with the game discs you purchase; you can sell them to other people, lend it to friends, trade it in at retail or even keep it forever. They've even posted an instructional video on how you can share games between friends.