To disable the Copy paste for the Confirm email text box we need to create our own control in pega by creating a new control and add the following html code in it and to reuse that control format in the required place 

The code in Html tab :

<input type="text"  name="<pega:reference name="$this-name" />" id="<pega:reference name="$this-Definition(pyPropertyName)"/>" value="<pega:reference name="$this-value" />" onselectstart="return false" onpaste="return false;" oncopy="return false" oncut="return false" ondrag="return false" ondrop="return false" autocomplete="off">