How to block copy paste in blogger | code

 <script type=”text/javascript”>
var omitformtags=[“input”, “textarea”, “select”] omitformtags=omitformtags.join(“|”)
function disableselect(e){
if (omitformtags.indexOf(e.target.tagName.toLowerCase())==-1)
return false
}
function reEnable(){
return true
}
if (typeof document.onselectstart!=”undefined”)
document.onselectstart=new Function (“return false”)
else{
document.onmousedown=disableselect
document.onmouseup=reEnable
}
</script>

Firstly you need to go in layout section, after that you need to click "add a gadget" after you need to select 4th option "html/JavaScript" 

After that you need to paste the code in content