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<mx:TextInput id="txtIp" change="txtChangeHandler(event)"/>
   
    <mx:Script>
        <![CDATA[
            private var controlFlag:Boolean = false;
            private function init():void{
                this.addEventListener(KeyboardEvent.KEY_DOWN,kbdHandler);
                this.addEventListener(KeyboardEvent.KEY_UP,kbuHandler);
            }
            private function kbdHandler(event:KeyboardEvent):void{
                if(event.keyCode==Keyboard.CONTROL){
                    controlFlag = true;
                }
                if(controlFlag && event.keyCode==Keyboard.V){
                    event.preventDefault();
                }
            }
            private function kbuHandler(event:KeyboardEvent):void{
                if(event.keyCode==Keyboard.CONTROL){
                    controlFlag = false;
                }
            }
            private function txtChangeHandler(event:Event):void{
                //
            }
        ]]>
    </mx:Script>

Try with this logic.. Let me know if it helps

I am not able to get this functionality by using your code.

Keyboard.V is not available.

Can you please tell me the solution.

I tried with the Key code value for V is 72 but still it doent prevent me for copy-paste.