Uploaded March 2026 | Updated September 2026, 39 minutes ago

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An early form of VHS video copy protection that weakens/modifies the vertical sync pulse, similar to StopCopy and Copy Guard, which not only foils attempts to copy and capture it, but can also make normal playback unwatchable, depending on your TV.

For more information, see my main channel video about Macrovision: youtube.com/watch?v=wh5WHYmxUCo

#Macrovision #copyright #VHS