«Mr. Chordia said that Alphonso has a deal with the music-listening app Shazam, which has microphone access on many phones. Alphonso is able to provide the snippets it picks up to Shazam, he said, which can use its own content-recognition technology to identify users and then sell that information to Alphonso».

Source : That Game on Your Phone May Be Tracking What You’re Watching on TV – The New York Times