1. A method for processing and uploading identifiers for updating a filtering system which controls access to Internet sites, the method comprising: requesting a download of identifiers, each identifier being associated with a category; determining whether a database of identifiers is to be uploaded to a database factory, wherein the database of identifiers includes at least one uncategorized identifier corresponding to a website/page requested to be accessed by a user; if the database of identifiers is to be uploaded, retrieving identifiers from the database of identifiers; uploading the database of identifiers; and determining whether the uploaded database of identifiers has been previously categorized at the database factory.