We use sophisticated software, our proprietary Click Protection System, that attempts to identify clicks by illegitimate bots, certain repetitive clicks, and other unusual clicks, and then filters out related charges for these clicks so you aren't billed for them. We look at what identifiable behaviors may indicate that a click has been made with “bad faith.” Of course, we can't reveal precisely how we define invalid clicks or provide details about our proprietary technology, because we don't want to help the bad actors.