lockbits arduino Mega2560

Other Hardware 3rd Party Boards
1

I am newbie in the Arduino,

i need help from this forum
is there the easiest way to lock sketches from another who will cloning.

sketches have been written on the board and upolads with the arduino IDE 1.6.8, and I will not reupload the board later. Can I lock it by not uploading the HEX file.
I've searched on several forums, just have to upload hex files.

I have avrdude and USB ISP programmers.

this is screen caputre my avrdude program

638×640 117 KB

thanks.