It was the smart move. The key wasn’t protecting financial transactions—just plastic toys. And enthusiasts buying blank tags are often the same people buying real amiibo for display.
While the keys themselves are small snippets of code, they are copyrighted material owned by Nintendo. Most reputable software will require you to provide your own key files rather than including them in the download. Once an amiibo is written to an NFC tag amiibo encryption key
: These keys are proprietary Nintendo property. Distributing them is generally considered a copyright violation, which is why most reputable apps (like AmiiBot or TagMo) require users to provide their own files rather than including them [5]. Common Use Cases It was the smart move