User comments or data entered on a scripting digital enabled camera.

Auxiliary data that your application can store in a QuickTime movie, track, or media structure. The user data is stored in a user data list; items in the list are referred to as user data items . Examples of user data include a copyright, date of creation, name of a movie's director, and special hardware and software requirements.

Data recorded by the user. User data is differentiated from other information recorded by either the drive or formatter.