CGMS-A
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Copy Generation Management System – Analog (CGMS-A) is a copy protection mechanism for analog television signals. It consists of a waveform inserted into the non-picture vertical blanking interval (VBI) of an analogue video signal. If a compatible recording device (for example, a DVD recorder) detects this waveform, it may block or restrict recording of the video content.
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It is not the same as the broadcast flag, which is designed for use in digital television signals, although the concept is the same.[1] There is a digital form of CGMS specified as CGMS-D which is required by the DTCP ("5C") protection standard.