There are more than a thousand books that you will never be allowed to read unless you leave New Zealand.
Many are of a sexual nature, deal with violence, horror and crime and might have only been fully read by one person in New Zealand – and that person decided they shouldn’t be available to the rest of us.
A total of 1319 books are banned and a further 728 restricted in some way.
It was up to the Office of Film and Literature Classification and the Censorship Compliance Unit to assess books, films, DVDs and even T-shirts and determine whether they should be banned or restricted.
http://www.stuff.co.nz/entertainment/books/5664782/More-than-1300-books-banned-by-censor

