It's been apparently confirmed that each household may only have one Spore account per copy, creating a large thread on the game's official forum and throwing yet another bone on the "PC protection issue" pile.
This obviously means that parents can't be playing different games to their children on the same computer.
"There is one Spore registration/account per game/serial code so you are correct in that you cannot make multiple accounts at this time. I have sent your guys' feedback to the game team though since I can understand the desire to share a game on a system that you entire family uses," said a rep.
Read the whole thing through there if you don't have much else to do today. It hasn't gone down well.