Digital Rights Management. If you know anything about Warden running in the background of Blizzard's games in order to prevent hacking, this is kind of the "anti-piracy" equivalent for music/offline games, except the program they use to implement it, SecuROM, has superuser access, is uninstallable (unless you reformat), and supposedly will run in the background even when Spore is not running. So it's essentially malware/spyware.
You can read the part about EA's use of it in previous games at
http://en.wikipedia.org/wiki/SecuROM#Controversies