Protect code on STM32

[mebab]

Hi,

I have written codes on my developed platforms for years and would like to keep them secured. Does anybody know how to protect a code on the STM32? I need it to be editable by myself whenever it is necessary but nobody else can download and discover the written code.

Thanks for your help!

[ag123]

the codes are in your sources, in stm32 it is only the binaries.

[mebab]

But, I think anybody can make another board behave the same as the first one based on the binary they get. Am I right?
Can we do this by 'Option bytes'?