There exist serial FLASH EEPROMs that have built in encryption... so reading out things in clear would need special means. There are also chips with same serial FLASH EEPROM interface that can do encryption and decryption for you using asymmetric technique... (using the public key to encrypt, and private key to decrypt... (of course, private key not with device out in the field... but safely guarded in your save environment).
Some chips have fuses that forbid the reading out... but I'm not aware of Espruino supporting that in the context of being reusable/reprogrammable...
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