HACKENSACK, N.J. – In the chilling book-turned-movie “Misery,” a famous author is held hostage by a psychotic nurse who tortures him into writing one more novel, whacking his feet with a sledgehammer when he doesn’t write it the way she wants.

In reality, a New Jersey woman claiming to be the psycho nurse wants Stephen King to stop writing about her.

Anne Hiltner, a Hightstown, N.J., freelance writer, says she is the inspiration for King’s sadistic nurse, Annie Wilkes, a character that netted an Oscar for actress Kathy Bates in 1991. Hiltner, 58, filed a $500 million federal lawsuit this month against the author, his publishers and several movie studios, accusing them of violating her privacy.

The lawsuit also accuses King and his distributors of defamation, copyright infringement and violation of antitrust laws for using her private diaries to create psychic Sally Druse, a similarly frightening character in King’s television miniseries “The Journals of Eleanor Druse: The Kingdom Hospital Incident,” which aired last year. The jumbled lawsuit doesn’t detail how King allegedly pilfered the diaries or what was in them.

It’s not the first time Hiltner has sued King for privacy or copyright infringement. In a similar 1991 suit that was ultimately dismissed, Hiltner accused King of breaking into her home numerous times and stealing several manuscripts written by her and her brother.

“We’re aware of her suit, and steps are being made to dismiss everything she’s done,” said King’s longtime agent, Arthur B. Greene.

Hiltner declined to comment.

Although the suit may not worry King or the movie executives, it does bring to light what experts say is a rare – and often futile – type of copyright lawsuit. Most copyright suits in Hollywood accuse writers of ripping off ideas and stealing scripts, but Hiltner and others claim their identities were hijacked for someone else’s gain.

That’s essentially what former boxer Chuck Wepner has claimed in a lawsuit against Sylvester Stallone. Wepner, now a Bayonne, N.J., liquor salesman, accused Stallone of using his 15-round fight against Muhammad Ali as inspiration for the “Rocky” movies – and then emblazoning Wepner’s name on movie posters and across a 25th anniversary DVD.

“Hollywood loves putting out movies that are based on true stories,” said Wepner’s lawyer, Anthony Mango. “But Stallone has used Wepner’s name in promotional materials without getting his consent or compensating him.”

Wepner’s $45 million suit, filed in 2003, is still pending.

The biggest hurdle for cases such as Wepner’s and Hiltner’s is the First Amendment right to free speech – a broad argument frequently used to fight copyright suits, said New York University Law School Professor Rochelle Dreyfuss, who specializes in intellectual property.

After all, musical artists often use the names and stories of famous people in songs without compensation. That practice was challenged when civil rights pioneer Rosa Parks sued the rap group Outkast for using her name in a 1998 song title. The suit was settled in April without an admission of wrongdoing.

Even when stories are based on true events and no real names are used, authors will still include a disclaimer that the characters are fictional.

“It comes down to just whether this person is trading off the real character’s personality,” Dreyfuss said. “In these cases that involve fiction, it’s not so easy to recognize the person in it, and it’s a lot harder to say someone is trading off that person’s personality.”

Wepner’s suit overcame the First Amendment hurdle last year when a judge refused to dismiss the case on the grounds that Stallone was exercising free speech. Mango said the ruling was a big win for his client.

Still, successes in such cases are rare, said Michael Carrier, an associate professor at Rutgers School of Law in Camden. Even if a plaintiff proves a script or person was copied, the final product still needs to be substantially similar to the original work.

“If the theme just involved a woman who went off the deep end and did some crazy things, that’s generic enough that it doesn’t qualify for copyright protection,” Carrier said. “If it did, then no one would be able to write anything.”