Sony GRAND WEGA KF-60DX100 Operating Instruction page 72

Using Custom
Rating Options
If you want to select the ratings to be blocked from Custom, follow the
procedure below.
1
Perform the steps 1 to 8 in "To select the rating" on page 69 to display
the Parental Lock options.
2 Move the joystick up or down to select "Custom," and press @.
3 Make sure that "Movie Ratings" is selected, and press @.
4 Move the joystick up or down to select the rating to be blocked, and
press @.
The B indicator automatically appears beside the selected rating and all
"higher" ratings, indicating that the programs that match the ratings will
be blocked.
To unblock a rating, select it by moving the joystick up or down, then
press @. The indicator B changes into "-" and all "lower" ratings are
unblocked.
72