Magento: Stop Copy And Paste Content From Site

This Functionality Can Be Using A small JavaScript as Below ::

just Copy and paste the following code to the Head page.

app/design/frontend/your_package/your_theme/template/page/html/head.phtml

<script type="text/javascript">
    function killCopy(e){
        return false ;
    }
    function reEnable(){
        return true ;
    }
    document.onselectstart = new Function ("return false")
    if (window.sidebar){
        document.onmousedown = killCopy
        document.onclick = reEnable
    }
</script>