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Restricted Section is an adult online fan fiction archive. It was opened in 2002 after adult-rated material had been removed from FanFiction.Net and contained clear "adult only" notices and other disclaimers. The name of the archive refers to the "restricted section" of the Hogwarts library in the Harry Potter books.
A Cease and Desist Letter
The sexually explicit content of the fan fiction available at www.restrictedsection.org, which is plainly based on characters and other elements of the fictional world created by Ms. Rowling in the Harry Potter books, is a matter of serious concern to our client. In addition, our client Warner Bros, which owns the film and merchandising rights to the children's series of Harry Potter books, is concerned to protect the integrity of its Harry Potter properties. For the avoidance of doubt, our clients make no complaint about innocent fan fiction written by genuine Harry Potter fans. There is plainly a very real risk that impressionable children, who of course comprise the principal readership of the Harry Potter books, will be directed (e.g. by a search engine result) to your sexually explicit web site, which you will appreciate most right-minded people would consider wholly inappropriate for minors. Plainly the warnings to the effect that children under 18 should not access your website do not in fact prevent minors from doing so. Indeed, such warnings may well serve simply to entice teenagers to your site. 
In spite of this, the website continued to operate. It currently requires readers to sign up for access by e-mail and to include an age statement.