Here is it is:
Select the program number u set for rai afr or rai as on the remote control. Then, press menu, scroll down to parental control, press the red button on the remote, and then select current key. Scroll down to the first key, select it with the ok key on the remote, and enter the key u find here: http://www.sat-universe.com/showthread.php?t=53186.
Repeat the same step for the second key, using the same key.
(tested on DS 1103 and works)