Samsung PN51F5300BFXZA - Manual (Page 22)

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To block certain content, you select a lock, and press ENTERE (That
is, you “click it”.). For example, click the X lock and you block all X-rated
movies. The rating categories are also grouped so that clicking one
category blocks all the categories a parent would block along with it.
For example, if you block the
PG-13 category, then R, NC-17 and X will
automatically be blocked also.
N To unblock a category, click the lock.