Apple has made changes to its App Store rules in an effort to restrict how developers gather, use and share information on iPhone users’ friends. 

The changes were made last week, according to Bloomberg. Developers ask users for access to their phone contacts and use the information for marketing. They may also share or sell it without permission from people in those contacts. But the new App Store Review Guidelines prevent developers from making databases with information taken from iPhone owners’ contacts, and restricts them from sharing or selling the database with third parties.

In addition, apps can’t get access to someone’s contact list and say it’s being used for something, then use it for something else, unless the developer obtains consent. Breaking those rules can get developers banned. 

“Do not use information from Contacts, Photos, or other APIs that access user data to build a contact database for your own use or for sale/distribution to third parties, and don’t collect information about which other apps are installed on a user’s device for the purposes of analytics or advertising/marketing.”

A similar practice of sharing friends’ data without their permission got Facebook in hot water earlier this year, after political consultancy Cambridge Analytica had improperly received data from as many as 87 million user profiles. Following the scandal, Apple CEO Tim Cook said Facebook had failed to effectively regulate itself. 

Apple didn’t mention the updated App Store Review Guidelines at WWDC earlier this month. The company didn’t immediately respond to a request for comment.