According to this blogpost https://limitedresults.com/2020/06/nrf52-debug-resurrection-approtect-bypass/ the APPROTECT feature to prevent code readout can be circumvent quite easily. What are the plans of Nordic to address that issue?
For our project, protecting the firmware is very essential and we planned to use that feature to protect our man year worth of software and to protect keys for signed firmware updates.
best regards,
Torsten