I was working with the Arduino IDE. I tried to find out from where a MCU can be locked so that nobody can make a clone from it. I found many answers describing something about lock bit. I realized that this lock bit can somehow stop users from cloning the chip. My first question is with which IDE or programmer I can change the lock bit? Second question : Can it be edited with a hex editor? If it is possible, what is the position/which number of bit should be changed? Third question: Is there any way to encrypt the code?
The lock bits can be used to prevent reading the code memory with standard programming tools. It only works up to a certain point, as a determined hacker with right tools can still extract and clone the firmware. So you can use the lock bits but don't expect that it will be 100% effective.