If you’ve purchased an iPad but have additional Apple devices, don’t worry, you can connect them all to the same iTunes account. All the media you purchase through iTunes, as well as your billing information, is connected to your iTunes account. To prevent media theft, Apple does not allow any device to be connected to more than one iTunes account, and only allows devices connected to the same iTunes account to share media. Tips Warnings Writer Bio

How to Add an iPad to Existing iTunes - 7