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"Dynamically Inserted Ads In recent years, ad technology has allowed for ads to be targeted and dynamically inserted at the time of file request. The ad server determines the best ad to serve to the listener at the time of request. In a podcast consumed online, ads may be inserted into a file that is being progressively downloaded at designated ad breaks . Some publishers may count this dynamic ad serve as an "impression" without confirming ad delivery. T he metrics in this document focus on confirming that the ad was delivered. S erver log s can confirm that the enti r e ad file was downloaded , but the process for counting a served ad can only determine that ad file was sent ."