It is difficult for us to detect fraud, we can only learn to avoid and not believe in something that smells fraudulent. Be careful to always keep personal data do not get tempted something big thing.
Do you seriously believe that you have personal data? Lol. Remember all the places where you were required to provide personal data. They are stored on a computer that employees have access to. Who can guarantee you that some employee will not sell your data to anyone. The situation is the same in the state registers.