Samsung PN51F5300BFXZA - Manual (Page 26)

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To block certain content, you select a lock, and press ENTERE (That is,
you “click it”.). For example, click the 18 ans+ lock and you block all TV
programs rated 18 ans+ . 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
8 ans+ category, then 13 ans+ , 16
ans+ and 18 ans+ will automatically be blocked also.
N To unblock a category, click the lock.