A Rich Site Summary or Really Simple Syndication (RSS) server includes: a Feed generating module, adapted to generate a Feed file according to user data and content data; a authorization setting module, adapted to set content authorization of accessing contents of the Feed file according to authorization information provided by a user; and a Feed sending module, adapted to send the Feed file to an RSS reader on a client. A RSS reader includes: an obtaining module, adapted to obtain the Feed file; a resolving module, adapted to resolve content authorization of the Feed file; and a displaying module, adapted to display contents of the Feed file according to the content authorization information of the Feed file. A method for providing Feed files and a method for reading Feed files are also disclosed. With the present invention, the authorization of reading Feed files is filtered, and the user requirements are fulfilled.