About Customer Accounts
Each customer who purchases your product must provide the e-mail address and password for an Amazon.com account during the purchase. The customer can't use that same Amazon.com account to purchase your product again, unless the customer cancels the account's subscription to the product first.
Each Amazon.com account is identified by an e-mail address and a specific password. It's possible to have multiple Amazon.com accounts that use the same e-mail address, but different passwords. AWS developer accounts are just Amazon.com accounts that have been enabled for use with Amazon Web Services.