More about the security code
http://kb.modularmerchant.com/a378-credit-card-security-codes.php
"All merchants are prohibited from storing CVV2 data. When asking a cardholder for CVV2, merchants must not document this information on any kind of paper order form or store it on any database." (http://usa.visa.com/download/merchants/rules_for_visa_merchants.pdf - Page 14)
http://kb.modularmerchant.com/a378-credit-card-security-codes.php