Understanding Per User CapsPer User Caps prevent the same ad from being shown to a user more often than a certain limit. For example, you can specify that the ad only be shown to each user three times per day, or once per week, etc.
Per User Caps rely on cookies stored on the user's computer to keep track of the number of views. Some user's security settings will not allow these cookies, and for those users Per User capping will not function.
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