Alters a previously-defined secure feature key by modifying the authorization key
        and/or the feature list.
Syntax
            
            
                sp_alter_secure_feature_key ( 
    name, 
    auth_key, 
    features )
             
         
Parameters
            
            - name – the VARCHAR (128) name for the secure feature key you want to alter. A key
                        with the given name must already exist.
 - auth_key – the CHAR (128) authorization key for the secure feature key.
                        The authorization key must be either a non-empty string of at least six
                        characters, or NULL, indicating that the existing authorization key is not
                        to be changed.
 - features – the LONG VARCHAR, comma-separated list of secure features
                        that the key can enable. The feature_list can be NULL, indicating that the
                        existing feature_list is not to be changed.
 
         
Privileges
            
            You must have EXECUTE
				privilege on the system procedure.  In addition,
                you must be the database server owner and have the manage_keys feature enabled on
                the connection.
         
Remarks
            
            This procedure allows you to alter the authorization key or feature list of an
                existing secure feature key.