We do not collect personal information for any use except to determine if you have an active subscription to CC0 Notes. 

This information is used to enable access to all CC0 Notes images for subscribed users. 

We use a third party partner (RevenueCat) to manage which users have an active subscription. Neither we nor RevenueCat share your data for any other purpose.   

Below is guide from the RevenueCat website explaining how RevenueCat users should report user privacy issues to the App Store.