Apple is expected to debut iOS 8 when it unveils the iPhone 6 on Sept. 9. Apparently, Apple has just informed developers that they are not allowed to sell user data gathered through iOS 8's new HealthKit platform . HealthKit will aggregate user data from a variety of health and fitness apps in order to provide a comprehensive health tracking interface. This announcement by Apple is intended to protect users from having developers sell their personal data to advertisers. 

This is all part of a new effort by Apple that includes stronger protections of user privacy and personal data as they prepare to launch their next generation OS and iPhone. Apple announced in June that a "Health" app would be part of iOS 8 and would collect personal user data like heart rate, blood pressure and other health-related information. Developers who make apps that work with HealthKit will be able to pull data from it, which raised understandable concerns about personal privacy. 

Enter Apple's new rules which make very clear that developers cannot sell the data they have access to through HealthKit. Apple has made provisions for developers to share data if it is for "medical research," reports Tech Times. Another stipulation of these new rules prevents any apps that don't specifically fit a health and fitness function. 

Apple announced HealthKit earlier this year at its annual WWDC developers conference. HealthKit is intended to be a user's overall health and fitness 'hub' that will provide them with overall health information. In order to make HealthKit relevant, Apple has partnered with leaders in the health industry, like the Cleveland Clinic, Mount Sinai health officials, medical records provider Allscripts and more. 

This week Apple sent out its press invitations to its Sept. 9 event, which is reportedly when the tech giant will announce both iOS 8 and the iPhone 6. The iPhone will reportedly come in two sizes, a 4.7-inch version and a 5.5-inch version. It is also expected that Apple's first smart watch will be announced during the event, which is rumored to collect much of the data that HealthKit would use.