It sounds like they will be doing something similar to Xbox 360s drm on digital content from this gen. You will have a console that you declare your "home" console, and you and anyone else can play any game on that system. And any other console you want to play the game on, you can log in and only your ID will have access to that game. Not sure if this is set in stone yet.
They mention it in this vid at about the 48 sec mark.
http://www.youtube.com/watch?v=dhfLBTPcG6U&feature=player_detailpage&t=48