Attachment.Locked Property (Access)
The Locked property specifies whether you can edit data in a control in Form view. Read/write Boolean.
The default setting of the Locked property is True. This setting allows editing, adding, and deleting data.
Use the Locked property to protect data in a field by making it read-only. For example, you might want a control to only display information without allowing editing, or you might want to lock a control until a specific condition is met.