Directory and file security

Directory-level and file-level security is available for Universal Disk Format (UDF) volumes. The system maintains the data authorities of optical directories and files for three groups of users: owner, group, and public. Volume-level security is also available through authorization lists.

Directory-level and file-level security is not guaranteed when volumes are removed and transported to and from other systems. Security information recorded in the UDF structures on the media might not have the same meaning on another system as it does on the system where it was written.