Samsung UN60ES7500FXZA - Manual (Page 176)

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G : General audience (no restrictions).
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PG : Parental guidance suggested.
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PG-13 : Parents strongly cautioned.
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R : Restricted. Children under 17
should be accompanied by an adult.
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NC-17 : No children under age 17.
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X : Adults only.
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NR : Not rated.
N To block certain content, select an
entry field to lock (That is, you “click
it”.). For example, click the X lock