The key unlocks the ability to separate grain from damage. It lets you tell the software: "That is a scratch, remove it. That is the film grain from 1984, leave it." Preserving grain is preserving authenticity. The key is the gatekeeper of that authenticity.
: If you cannot find the key, ScanSpeeder's official blog outlines that you can contact their support with your purchase details to have it retrieved. 💻 Using the Key key of scanspeeder