To revoke privileges given by a specific grantor:
There is a difference between revoking privileges from the Show Grantors window and revoking privileges from the Privileges window. In the case of multiple entries for the same grantor in the Show Grantors window, all privileges given to the user ID by the grantor are revoked. However, revoking privileges by one grantor does not affect the same privilege given to the user ID by a different grantor. The user ID retains the privilege as long as at least one grantor has given it.