To help developers get through the iOS 8 app approval process, and to help protect customers from any misuse, accidental or intentional, Apple has updated their App Store Review Guidelines to cover Extensions, HealthKit, HomeKit, Test Flight, and more. The update includes a restriction against storing HealthKit data on iCloud, sharing HealthKit data with third parties without consent, charging for extensions via in-app purchase, and collecting custom keyboard data for anything other than improving the keyboard.
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