Credit Card Knight is a security utility scanning your autocomplete fields for credit card numbers and removing them if you need it. Doing it Credit Card Knight helps you to prevent your credit card data from being stolen. Prevent your credit card data from being stolen by carders.Most Internet Explorer users have autocomplete settings on. When you are shopping on-line and filling an order form, Internet Explorer saves the data you have entered into a safe place (Windows Protected Storage). Protected Storage, however, is not so safe and it is possible to read what it keeps. So your credut card data may be accessed by a violator.