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To enable blocking duplicate creatives, select Blocked in the Duplicate Creatives pillbox. This setting is set to allowed by default.

How does this work?

To determine the uniqueness of a creative, SpringServe compares media file url returned in the VAST response of a demand tag. When this Setting is set to Blocked, SpringServe will throw out responses from demand tags that return the same media file url as another demand tag in the pod response. For the demand tags that get excluded from the pod due to their creatives being duplicate, the ad server will fire a VAST Error Code on the demand tag specifying that this was excluded from the pod due to the creative being a duplicate.