In the US more and more parents are pressing schools to withdraw books with bad language or sexual content. But should children's books be restricted in this way?
There is a battle being fought in America over books.
The skirmishes see concerned parents "challenge" books which are being used in schools.
Other parents are fighting for the right of their children to go into their school library and pick up those very same books.
There's a disparity between the US and UK. While in the US, formal challenges to books in school libraries are routine, they are very unusual in the UK.
Part of the difference is in the level of local control over schools. Typically in the US, locally-elected school boards can have books withdrawn when parents petition them.
In the UK, control lies almost exclusively in the hands of headteachers, says Sally Duncan, of the School Library Association. She can recall one primary school that refused to have any Harry Potter books because of the supernatural content, but such moves are rare.
"Parents are perhaps less likely to complain about the content of books in the UK as, by and large, we are a less 'religious' society," says Ms Duncan.
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