Paramount and Fox. I'm sure the two of them, Fox especially, have their own auditors checking over the books to make sure they get their share. 'Creative bookkeeping' is a mainstay in Hollywood, so they'd know what to look for.
Even knowing what to look for wouldn't necessarily stop it. There are yearly lawsuits filed for these sorts of things and the plaintiff doesn't always win, it may be worth it on their part to give it a try and hope to win. Corporations do risk/reward assessments for these type of things all the time.
