Disable read back option for Atmega328p

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fouwad

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I am using Arduino UNO board and I want to disable read back option for my code, I know it's the machine code that is read back but still I want to make it safe. How to do it. I have read about the fuses but not sure which fuses to use to disable this option. Please guide
 

According to the user manual:

"LB mode 3 with LB2 = 0 and LB1 = 0

Further programming and verification of the Flash and EEPROM
is disabled in Parallel and Serial Programming mode. The Boot
Lock bits and Fuse bits are locked in both Serial and Parallel
Programming mode. "

The lock bits can be programmed using avrdude and serial programming through the spi serial interface.
 

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