Content management for a video signal

摘要: A high definition television video content management and/or copy protection method and apparatus are achieved by modifying portions of one or more channels an HDTV (high television) signal. These modifications generally in the blanking intervals but can extend into overscanned portions. In version, signal modification defines tags trigger bits for a control system. This may follow tri-level sync (synchronization) pulses example, it occur at least channels. another pulse modified to cause reference sensing circuit such AGC system (in receiving device as recorder) produce erroneous output. Optionally, be added inserted following pulses. pseudo intervals. asymmetrical followed Further, any above signals modulated (e.g., amplitude, position, pulse-width). Also these provided generic