Now I'm gonna give you the best solution on how to protect your blog posts from copying by article thief.
Here the best and easy solution
First, Go to blogger Dashboard and select Layout
Then, Select Add a Gadget
Choose HTML/JavaScript
Then copy paste this simple code in Red. Save it. That's it! Check it out yourself!
<!-- START disable copy paste -->
<script src='demo-to-prevent-copy-paste-on-blogger_files/googleapis.js'></script><script type='text/javascript'> if (typeof document.onselectstart!="undefined" ) { document.onselectstart=new Function ("return false" ); } else{ document.onmousedown=new Function ("return false" ); document.onmouseup=new Function ("return true" ); } </script>
<!-- END disable copy paste -->