1. A server computer providing search results to a client computer, the server computer comprising a processor configured to: receive a request at the server computer for a search query from the client computer, the request comprising a maximum number of documents to be displayed on a results page, retrieve a number of the documents from a memory relevant to the search query, the number of documents retrieved greater than the maximum number of documents to be displayed on the results page by a predetermined amount; determine access rights corresponding to a plurality of retrieved documents; maintain session state information, the session state information comprising a first value representing a number of documents for which a user is determined to have access rights and a second value representing a number of documents for which the access rights have been determined; retrieve a number of additional documents relevant to the search query, the number of additional documents determined from the session state information; determine access rights for a plurality of the additional documents beginning with a document following the number of documents for which the access rights have been determined; and instruct the client computer to display the documents on the results page for which the user is determined to have access rights.