Samsung 4000 Series User Manual page 119

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.
To unblock a category, click the lock.
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