Sony PlayStation Portable PSP-1004 Instruction Manual page 106

Parental Control Level
Some types of content (such as games or video) have a preset parental control
level based on the content. You can set the parental control level on the system
to restrict the playback of content with a level that is higher than that set on the
system.
Parental Control Level
The parental control level of the system can be either turned off or set to one of
11 different levels.
Off
11-1
The default setting for the menu item is "9".
The combination of the parental control levels of both the PSP
content determine whether the content can be viewed or not. The combination
of the two levels is displayed in the table (
Example: If the parental control level of the system is set to "9", content with a
level from "1" to "9" can be played on the system.
106
Security Settings
Turns off parental control
Sets the level of content to be restricted. A setting of "1" is the most
restrictive; "11" is the least restrictive.
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page 107).
system and the