There has been attempts but they have fared poorly: https://petapixel.com/2011/04/28/nikon-image-authentication-system-cracked-just-months-after-canons/ https:/

There has been attempts but they have fared poorly: https://petapixel.com/2011/04/28/nikon-image-authentication-system-cracked-just-months-after-canons/ https://petapixel.com/2011/04/28/nikon-image-authentication-...