It means either the files you are trying to copy are encrypted, or the user account copying them do not have access rights to those files. Since you are using Backup Read/Write copy method, it is automatically (silently) reverted to Standard Windows file copying method.
The above information is already available in the Copy/Delete section of the Help file of the program. For more info, please read the Help file.
The above information is already available in the Copy/Delete section of the Help file of the program. For more info, please read the Help file.