iOS development reference Secue Coding Guide https://developer.apple.com/library/archive/documentation/Security/Conceptual/SecureCodingGuide/Introduction.html#//apple_ref/doc/uid/TP40002415 App Sandbox Design Guide https://developer.apple.com/library/archive/documentation/Security/Conceptual/AppSandboxDesignGuide/AboutAppSandbox/AboutAppSandbox.html Core Data FetchRequest for WatchOS in SwiftUI https://schwiftyui.com/swiftui/coredata-fetchrequest-for-watchos-in-swiftui/ File System Programming Guide https://developer.apple.com/library/archive/documentation/FileManagement/Conceptual/FileSystemProgrammingGuide/FileSystemOverview/FileSystemOverview.html Entitlement Key Reference https://developer.apple.com/library/archive/documentation/Miscellaneous/Reference/EntitlementKeyReference/Chapters/AboutEntitlements.html Changing Access Controls on User Data https://developer.apple.com/documentation/cloudkit/changing_access_controls_on_user_data/