I don't export books so I've never had that specific one but if I'm reading it correctly it's a pretty standard agreement that you understand items under that HS code can be rejected if they contain the content described.
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In my case a lot of the manufacturing technology I deal with has potential for restricted applications like military technology. They don't want to reject the category outright so they ask me to confirm that I understand the restrictions.
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Then they do whatever at the relevant borders.