Rogers NHL Gamecentre Live is the NHL's premium out-of-market streaming service for Canadians.
This service is for following an out-of-market team, as many local team games will be blacked out on Gamecentre. For example, those who live in Alberta will not be able to watch Oilers or Flames regional broadcasts on Gamecentre.
Note that if you subscribe to a cable package and have access to the broadcast channel of the game, the blackout will be lifted in Gamecentre (if your television provider integrates its login with Gamecentre).
Nationally broadcast games (i.e. Hockey Night in Canada) are not blacked out on Gamecentre.
Finally, note that even if a game is blacked out live, it will be available to stream from the archives within 48 hours of the live broadcast.