You mean the OCR? I'd like to verify about this too, but *presumably* it's an offline standard OCR method. Hopefully. Since it's primarily for text being rendered within the same computer and thus digital accuracy of digital fonts, it *probably* doesn't require much to do an OCR and even simpler/older methods likely work well without having to resort to "AI" "vision" methods.
Or so I hope (but still would like to see confirmation.)
EDIT: Someone says they looked at the code and it's local OCR via a long time developed OCR model.