How many people can share apps and music on Apple's Family Sharing in iOS 8?

iOS 8 allows one credit card holder to set up a master account for up to six devices to share all content purchased from iTunes, iBooks and the App Store. The master account holder must approve all future purchases made on that credit card, and members of the Family Plan do not need to share an Apple ID. This allows parents to control purchases made on any family devices, including the iPod touch, iPhone and iPad, and allows families to share content like games or music with other family members.