If you want to stop people on Wordpress selecting your text to copy it to something else, navigate to your site appearance then choose customise, the choose "Custom CSS" once there are this code...
This CSS that covers all browsers will effectively stop someone highlighting the text and images and copying it to somewhere else.
However, please bear in mind. If you have commands you need to copy it will also disable that as well, once you apply that CSS do you need to manually type the commands from your screen.