Symantec uses a "billing update service" through many national banks to find out the new card numbers and expiration dates of your credit and checking account cards. Even if you have an entirely new credit card number from the one they have on file for you, if the old card is through a bank, they can find your new one and charge it without your permission if you have auto-renewal selected. I received an auto-renewal notice saying my card on file (a card I had replaced a year ago) was expired and that I needed to provide a new... read full review »