Not sure why Xbox fans have to keep bringing Sony into this. Just hoping they aren't the only ones with DRM, I suppose. Of course, if people actually paid attention to Sony after the reveal, they would know the truth already. Sony is not putting DRM into their console. You can play the PS4 completely offline. Oldschool. Yoshida also already said that used games were allowed. If 3rd parties want to do DRM, they will have to make their own system, on their end, to do so. Of course, that would only apply to online gameplay, since the PS4 can be played OFFLINE.
So, why did Sony patent that tech? Honestly, I think they did it to back MS into a corner. I think Sony heard MS was looking to lockdown their console, so they went and patented one of the few ways, if not the only way, to do offline DRM. This would force MS to either pay them to do offline DRM or go with online DRM. Of course, Sony knows that this extremely limits the audience that MS can sell to. Just my theory, anyway.
Also, one has to look no further than Yoshida trolling people about DRM (Death Ray Manta) coming to Vita to see that Sony has no plans to go down the DRM route.