Televisions are not equipped with an AGC circuit so Macrovision did not impact direct viewing from VCR to Television set. Since VCR unites are typically equipped with an AGC circuit, this prevent VHS copy from producing a desirable video replica. For example the picture get's to dark or to bright. The AGC kicks in and adjusts the video output to what it thinks should be. The additional video information may make the AGC think that a sound picture is way to bright or way to dark. MacroVision now inserts bright white and black signals in the non-visable area of the TV-picture. Normally the AGC is supposed to amplify weak signals and dimm the too strong signals. This type of Macrovision worked by abusing the Auto Gain Control (AGC) features of a video-recorder. Video Rental was the source for much video piracy. The original Macrovision copy protection was used on VHS tapes to prevent consumers from connecting two VCR's together with RCA style cables and dubbing VHS tapes. Macrovision is a company that develops copy protection schemes for DVDs, VHS Tapes and Television Content.
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