Krell Industries DVD Standard - Manual (Page 58)

54 Krell DVD Standard
If anyone attemps to play a disc that exceeds the viewing level, the
following message appears:
USER PARENTAL LOCK IS SET . NOT ABLE TO PLAY .
If you wish to play the disc, you must reset the viewing level.
Press the setup button or key, enter your password, then select
viewing level. Set the viewing level to off or to a higher setting
such as 8.
System Setup, continued
PARENTAL MENU, continued