What Cat said.
It's like Yogurt (real Yogurt anyways).
It's a soured milk product which means it's already spoiled, it can't get anymore spoileder. It MAY taste a little more sour, but it won't go bad.
Took my kids on a tour of the Stoneyfield Yogurt plant, and we were told the same thing.
"Scrape off the mold and eat up."
You don't even have to keep it refrigrated, though the cold will stop most of the mold growth.