Before today's PlayStation 4 announcement, rumors had flown about whether or not Sony would implement a system to block users from playing second-hand games on the console. It wasn't addressed in the company's presentation, but now Shuhei Yoshida, President of Sony Worldwide Studios, has denied the reports.
In response to a question by Eurogamer, Yoshida said "[Consumers] purchase physical form, they want to use it everywhere, right? So that's my expectation," before declaring "Used games can play on PS4." There's still a lot we don't know about the PlayStation 4, but it's good to have at least one burning issue cleared up. Whether Microsoft implements a similar system, however, remains to be seen.