ESP32 Forum

Hello.

I am developing a product use ESP32 module.
The firmware image will be released / sold with a license key based on MAC address on each module.
My question is:
- Is it a good idea to use nvs_storage.c lib to save the key?
- Is it internal flash or SPI to the external. If it is external, it doesn't work for me because people can just copy the whole external flash.

Thanks

There is no internal flash, although you could perhaps use the eFuses for license purposes. If you do want to use the flash, I'd suggest you look into SecureBoot / flash encryption: that both makes it impossible to just copy the flash (as it's encrypted with a key that only the paired ESP32 knows) as well as read out the firmware and patch the licensing code.