Sony has researched and filed a patent for new technology that could be implemented to block used games.
Games that are discovered to be tied to another user's account could potentially be rejected. The system works, according to the document, by attaching contactless RF "tags" to each game that can be be read without a network connection.
The filing does not mention any specific system for the technology's use. However, past speculation suggested Sony was interested in curbing second-hand sales with the PlayStation 4.
Read more of Sony patents tech to block used games at GameSpot.