Samsung PL64E8000GFXZP - Manual (Page 170)

you block programs you've determined
are inappropriate for your children
based on their ratings. To access the
Program Rating Lock feature and make
any changes, you must enter a PIN
(personal identification number). To
watch a blocked program, you must
also enter the same PIN.
N The Program Rating Lock is not
available in HDMI, Component mode.
N The default PIN number for a new TV