Prevents any access to the folder and its contents. Specifying No Access for a user prevents access even if that user belongs to a group that has access to the folder.
See Also
Standard object and folder permissions
List (RX)(Not Specified)
Read (RX)(RX)
Add (WX)(Not Specified)
Add & Read (RWX)(RX)
Change (RWXD)(RWXD)
Full Control (All)(All)