Credit card - you only need it to register and then to purchase music & apps - for free apps, you don't need any credit card registered, so, after registration, you can easilly remove your credit cards informations One computer only - Apple has the most permissive DRM system managment on the market : it allows you to copy your purchased files (music, apps ...) on 5 devices ... - Please compare with Microsoft or Sony online music stores and take a good relaxing laugh ! - Indeed, you cannot share music between iPods or iPhones, and you cannot use these devices to share music with any computer. In fact it's just because of intellectual property considerations, you know : you don't have the right to share the music you buy. It sucks sometimes but it's the law.