You don't need the whole number, but you do need the last 8. However the card number for a given book can be reset. Here's the instructions from the eReader.com FAQ:
Quote:
How can I change my Credit Card to unlock new books?
The first is to buy more books with your new credit card. Once you have made a purchase with a new credit card, you can log in to your account and reset the unlock code on your previous purchases to be the new credit card, then download the books again. In this case, a new purchase is required to verify the new credit card number.
Your second choice, if you do not wish to purchase additional books at this time, is to reply to this message with a phone number and time of day when it will be convenient for us to call you and provide you with the old number over the phone. For security reasons, we cannot send credit card numbers through email.
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Hope that helps.