Changing inherited permissions
If the check boxes are shaded when you view the permissions of an object, the object has inherited permissions from the parent object. There are three ways to make changes to inherited permissions:
On the Advanced page, in Permission entries the Apply To column lists what folders or subfolders a permission is applied to. The Inherited From column lists where the permssions have been inherited from.
If the Special Permissions entry in Permissions for user or group is shaded, it does not imply that this permission has been inherited. This means that a special permission has been selected. For more information, see To set, view, change, or remove special permissions for files and folders