Only a rumour so far, but knowing what assholes Sony are, I expect it will happen. A patent has been filed, which will restrict a game CD to work only on the unit it was first played on. Patent application It is rumoured this technology may be installed in the PS3. It would stop you taking a disk to a friend's place; stop renting of used games; stop sale of games on ebay. If your PS3 broke or was stolen, your games would not work on the replacement unit. What Joystiq said. What The Inquirer said. If Sony aren't sued first, I'm sure some smart person will produce a hardware mod to overcome this misuse of technology.