This shouldn't be a shock to anyone but just a reminder that just because Sony says that they won't enforce any kind of DRM on used games themselves, that doesn't mean that publishers can't use their own methods.
There's nothing stopping companies like EA or Activision from enacting the same policies that we're going to see on the Xbox One with their games on the PS4. Jack (motherfucking) Tretton said on GameTrailers today:
"Well, I mean, we create the platform, we've certainly stated that our first-party games are not going to be doing that, but we welcome publishers and their business models to our platform. There's gonna be free-to-play, there's gonna be every potential business model on there, and again, that's up to their relationship with the consumer, what do they think is going to put them in the best fit. We're not going to dictate that, we're gonna give them a platform to publish on.
The DRM decision is going to have to be answered by the third parties, it's not something we're going to control, or dictate, or mandate, or implement."