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I think the Macrovision acts on the video AGC (automatic gain control) of VCR's, causing the light/dark changes in the picture when playing/recording a Macrovision-encoded video through another VCR.
The Macrovision is something in the vertical blanking interval...if you adjust the vert hold on the TV you can see it puts white rectangles into that normally black bar.
There used to be some devices to remove the Macrovision pulse
("video stabilizer") that you could insert in the video line.
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