To detect copy, paste and cut behavior, you just need to bind the corresponding event type.

$("#textA").bind('copy', function() {
    $('span').text('copy behaviour detected!')
});	
$("#textA").bind('paste', function() {
    $('span').text('paste behaviour detected!')
});	
$("#textA").bind('cut', function() {
    $('span').text('cut behaviour detected!')
});

If you are using jQuery 1.4x, it’s support the multiple events declaration like following :

$("#textA").bind({
	copy : function(){
		$('span').text('copy behaviour detected!');
	},
	paste : function(){
		$('span').text('paste behaviour detected!');
	},
	cut : function(){
		$('span').text('cut behaviour detected!');
	}
});

Try it yourself

<html>
<head>
<script type="text/javascript" src="jquery-1.4.2.min.js"></script>
 
<style type="text/css">
	span{
		color:blue;
	}
</style>
 
</head>
<body>
  <h1>jQuery copy, paste and cut example</h1>
  <form action="#">
  	<label>TextBox : </label>
	<input id="textA" type="text" size="50" 
          value="Copy, paste or cut message here" />
  </form>
 
  <span></span>
 
<script type="text/javascript">
 
$(document).ready(function() {
 
	$("#textA").bind({
		copy : function(){
			$('span').text('copy behaviour detected!');
		},
		paste : function(){
			$('span').text('paste behaviour detected!');
		},
		cut : function(){
			$('span').text('cut behaviour detected!');
		}
	});
 
});	
</script>
</body>
</html>
Try Demo
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