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June 17, 2002
Macrovision headaches
Macrovision is a company specializing in copy protection technology. I've encountered macrovision when I tried piping my DVD player through my VCR to my TV (because my TV didnt have an AV in). Macrovision leverages the fact that VCR's have AGC circuitry (Automatic Gain Control) which attempts to compensate for extra brightness. Macrovision includes extra signals in the non-viewable portion of the signal to cause the AGC to kick in and render the copy unviewable. For more information on this particular technology check out the FAQ
Posted at June 17, 2002 10:06 AM