8. A system comprising: a data processing apparatus with one or more processors; and a computer-readable memory in data communication with the data processing apparatus and storing instructions executable by the one or more processors and upon such execution cause the data processing apparatus to perform operations comprising: storing one or more graphical documents; storing content rating information associated with the one or more stored graphical documents; comparing graphical content of a graphical document under evaluation with graphical content of the one or more stored graphical documents to identify a matching graphical document; and granting a distribution approval to the graphical document under evaluation based on the match and content rating information associated with the matching graphical document.
8. A system comprising: a data processing apparatus with one or more processors; and a computer-readable memory in data communication with the data processing apparatus and storing instructions executable by the one or more processors and upon such execution cause the data processing apparatus to perform operations comprising: storing one or more graphical documents; storing content rating information associated with the one or more stored graphical documents; comparing graphical content of a graphical document under evaluation with graphical content of the one or more stored graphical documents to identify a matching graphical document; and granting a distribution approval to the graphical document under evaluation based on the match and content rating information associated with the matching graphical document. 13. The system of claim 8 , wherein: at least one of the stored graphical documents includes an approved advertisement image; and the instructions cause the data processing apparatus to perform operations comprising: identify the approved advertisement image as the matching graphical document if the graphical content of the graphical document under evaluation is substantially identical to graphical content of the approved advertisement image; and grant the distribution approval the first graphical document based on content rating information associated with the approved advertisement image.