That you can't use 2 accounts on the game. Like I got my Spore account, and my sis got a Spore account. So when I log of my user on the computer. And my sis logging in and tries to play with her Spore account, it says something like "linking the installation of Spore to your Spore account" and then it says "In logging failed: The code to this installation is
invalid and can not be used to link your product to your account." 