Sony PS4 Will Play Used Games

Sony has officially confirmed that the PlayStation 4 will be able to play second-hand games after all, after a patent on a method of blocking them and the much enhanced online delivery system of the new console led to much speculation that it would finally axe the used game market with a registration system.
Whilst downloadable titles – seemingly intended as the main delivery method – will of course be at the whim of Sony’s highly reliable servers and not subject to resale or unrestricted transfer, Sony honcho Shuhei Yoshida has confirmed physical copies will be playable without restriction even if previously owned:

[Do you agree that if you buy something on a disc, that you have a kind of moral contract with the person you've bought it from that you retain some of that value and you can pass it on?]
“Yes. That’s the general expectation by consumers. They purchase physical form, they want to use it everywhere, right? So that’s my expectation.”
[So if someone buys a PlayStation 4 game, you're not going to stop them reselling it?]
“Used games can play on PS4.”

 Another interview carried a similar confirmation by Yoshida, also seemingly ruling out region locks:

 “When you purchase disc-based games for PS4, they will work on any hardware.”

Suspicions that Sony was planning on eliminating the second-hand sales market as a way of reclaiming the billions in revenue it apparently siphons away from game publishers and into the coffers of game retailers flared after it emerged that Sony recently patented a method of blocking used games from functioning, although Sony denies it has anything to do with the PS4.
However, in other comments Yoshida also revealed that publishers will be able to add anti-resale registration schemes to their titles themselves, potentially allowing them to block or discourage resale without any PR hassle for Sony.

source: Sankaku Complex