Data recoverable after using CD DVD Eraser software?

Hi guys,
There is a certain thing about this erasing software that I am not sure about. I have a CD DVD Eraser software installed. Its a freeware though. However, I will like to know if we ever erased the data from the CD or DVD, can it be recovered back? If it is possible, how do we go about doing it? I thought it was impossible, but nothing is impossible until we try it right?
