Samsung 5500 Series User Manual page 118

To block certain content, you select a lock, and press ENTERE (That
is, you "click it".). For example, click the 18+ lock and you block all TV
programs rated 18+. 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 G category, then PG, 14+ and 18+
will automatically be blocked.
To unblock a category, click the lock.
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