yah, Hats. it's called security and for your protection. If you lose your CC, and somebody finds it and tries to buy something online, the site for security reasons wants the buyer to be the person who owns the card, who knows the billing address of the card. If you are so worried about your CC number being out there, you can do this. Register properly, get the file, you will receive a few emails. One will have an attachment. Open that and save the pdf to your hard drive, that's the file of letters all in date order. They are copies of the actual letters, scanned into a pdf format. Now, after you get the file, call your CC company and say you lost your CC can you cancel it and send me a new one with different numbers. Find out how long b/4 the new one comes and plan to not use a CC in the meantime. I first got the file with letters between Heinlein and Hubbard, based on Face saying a few times he wished he had read those letters in the very beginning and he would have not gotten involved. So after reading those letters, for some reason I was curious if there were letters between Campbell & Heinlein. Sure enough there was, I find these letters even more fruitfull with early information. I've never had any problems with my CC.