# CFFileSecurityCopyOwnerUUID(_:_:) Copies the owner UUID associated with a `CFFileSecurityRef` object. ``` func CFFileSecurityCopyOwnerUUID(_ fileSec: CFFileSecurity!, _ ownerUUID: UnsafeMutablePointer?>!) -> Bool ``` ## Parameters `fileSec` The `CFFileSecurityRef` object. `ownerUUID` The address of a `CFUUIDRef` where the results are stored. ## Return Value Returns `true` if an owner UUID was successfully copied, or `false` if there is no owner UUID property associated with this `CFFileSecurityRef` object. ## Discussion --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)