Abstract: A method and system for selectively targeting advertisements and programming to different demographically and specially targeted television audiences by relating carrier subscriber data to other proprietary marketing databases by creating, compiling and updating a National Directory of cable and other carrier system subscriber names and address information derived from actual cable system and telephone company billing records; providing proprietary software to participating carrier systems to allow them to modify the subscriber records in a uniform fashion at the carrier system level using unique electronic address designations, by encoding the subscriber information into encoded binary streams using proprietary binary conversion rules and binary signatures assigned to the carrier systems, and changing the conversion rules, signatures and their carrier designations for security on a monthly basis when the National Directory is updated; licensing the Directory to qualified data processing companies or their cl