Files that are infrequently accessed are rapidly removed in most cases, whereas popular downloaded files are retained. (items 7–8) Because only a small portion of users pay for storage, the business is dependent upon advertising. Adverts are primarily viewed when files are downloaded and the business model is therefore not based upon storage but upon maximizing downloads. (items 7–8) Persons indicted have "instructed individual users how to locate links to infringing content on the Mega Sites ... [and] ... have also shared with each other comments from Mega Site users demonstrating that they have used or are attempting to use the Mega Sites to get infringing copies of copyrighted content." (item 13) Persons indicted, unlike the public, are not reliant upon links to stored files, but can search the internal database directly. It is said[by whom?] they have "searched the internal database for their associates and themselves so that they may directly access copyright-infringing content". (item 14) A comprehensive takedown method is in use to identify child pornography, but not deployed to remove infringing content. (item 24) Infringing users did not have their accounts terminated, and the defendants "made no significant effort to identify users who were using the Mega Sites or services to infringe copyrights, to prevent the uploading of infringing copies of copyrighted materials, or to identify infringing copies of copyrighted works" (items 55–56) An incentive program was adopted encouraging the upload of "popular" files in return for payments to successful uploaders. (item 69e et al.)