Samsung UN65D8000XFXZA - Manual (Page 123)

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English
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To unblock a category, click the lock. To unblock all the categories in a
row, click the lock under ALL.
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To watch a blocked program, you must enter the Security code when
requested.
Movie Rating (MPAA) : You can block movies based on their MPAA rating.
The Motion Picture Association of America (MPAA) has implemented a rating
system that provides parents or guardians with advanced information on which
films are appropriate for children.