Pro Evolution Soccer on PS3 locks online play to registered user
Something which many of us missed from GameSpot's review on PES 2008 for the PS3 is that the online registration process locks your copy of the game to your Konami account. So therefore, if you ever wish to sell your copy of the game, then the buyer will have to have your registration details in order to go online.
To quote: It's also worth noting the online registration process, which locks your copy of the game to your Konami account for online play. This means that if you ever want to sell your copy of the game, the next person will be unable to play online unless he or she has your registration details.