Systems and methods for content delivery and management

摘要: A content management method uses a portable multifunction device 202 to detect human-inaudible acoustic signals 210, when that signal is heard from the surrounding environment by microphone 1 13 or output device's audio circuitry 100. The extracts code inaudible and supplies via wired wireless communication 232, along with additional optional data regarding and/or its user, system 200. Upon receipt of code, indicating received 210 202, 200 may provide particular pointer being selected based on received. Additional threshold triggers 502 be delivered require actions unlock content.