What i understand is that they could also allow owners who already own current PS3 games ( disks ) to put the disk in the PS4, the system will read that its a PS3 game ( example uncharted 3 ) and then will put that game into your stream account as game owned and then you can play the game on PS4 instead of buying it again ( they could also limit each game disk to 2 uses on PS4 so that not everyone get disks from their friends and have them on PS4, i understand each game disk got its own special code ).
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