"Special permissions"

[rnb]

Some time after using SD to make safety clones and a sandbox this message appeared after repairing permissions:

Repairing permissions for “Macintosh HD”
Determining correct file permissions.
We are using special permissions for the file or directory ./System/Library/Filesystems/cd9660.fs/cd9660.util. New permissions are 33261
The privileges have been verified or repaired on the selected volume
Permissions repair complete

What does this mean? is this something that SD has done? Should I be concerned?

Thank you.