The present invention is intended to provide network delivery data transmitting methods and receiving methods which allow the selection of content data as desired by user. In a data transmitting system, a specification information packet for specifying a content source used, plural packet sequences each...http://www.google.com.au/patents/US20030058866?utm_source=gb-gplus-sharePatent US20030058866 - Network delivery data transmitting method, network delivery data receiving method, network delivery data transmitting system, and network delivery data receiving system