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Code protection

Hello,

Is there a way to protect the code from being duplicated.

- One solution would be code reading lock! But I think it is not possible here?

- Another solution would be crypting the comunication between the CPU and the code flash like in FPGA application?

- Another one : Burn non external readable a crypo key inside the CPU to be authentified by an high level applicion?

If you have any other solution to propose?

Best regards,

Christian Lambricht