Fan fiction

I read this interesting thing about the Catcher in The Rye recently. 


In 2009 author J D Salinger successfully sued to stop the U.S. publication of a novel that presents Holden Caulfield as an old man.


The novel's author, Fredrik Colting, commented, "call me an ignorant Swede, but the last thing I thought possible in the U.S. was that you banned books." 


The issue is complicated by the nature of Colting's book, 60 Years Later: Coming Through the Rye, which has been compared to fan fiction. Although commonly not authorized by writers, no legal action is usually taken against fan fiction since it is rarely published commercially and thus involves no profit. Colting, however, has published his book commercially. Unauthorized fan fiction on The Catcher in the Rye existed on the Internet for years without any legal action taken by Salinger before his death.