A detection apparatus includes a tuner tuned to the program and a meter coupled to the tuner and arranged to detect content ancillary information from the program tuned by the tuner. The content ancillary information may be a media link, closed captioning information, or the like. The meter may also...http://www.google.fr/patents/US7757248?utm_source=gb-gplus-shareBrevet US7757248 - Detection of media links in broadcast signals
