It is not practical to implement firmware readout protection on ESP8266 because even if the ESP8266 refuses to read the firmware, someone may simply de-solder external flash and read it out.
Chip ID + certificate or Chip ID + online authentication are much better. You may post your requirements in the "Free Market" section and I'm sure someone in the community would like to develop the feature for you. 
Statistics: Posted by Guest — Tue Aug 23, 2016 4:01 pm
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