How to avoid 3rd party reading code from flash

Question

Using J-link programmer, I try to figure out how to set some kind of security bit to avoid 3rd party reading code from flash. 
 If you could please return me a helpful link. 
 Thankyou 
 Kim Hansen

Hadi Deknache · Accepted Answer

Hi Kim, 
 Think this post might be of interest: 
 https://devzone.nordicsemi.com/f/nordic-q-a/15900/nrf52-flash-protection 
 You should be able to write 0xFFFFFF00 to following register NRF_UICR->APPROTECT to protect the code in the flash. 
 Edit: 
 You could also as Nguyen mentioned protect the application directly, by adding --rbp ALL when flashing with nrfjprog 
 /Hadi

How to avoid 3rd party reading code from flash

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