The suit contends the museum has profited from the unauthorized use of Lee's name and book title through the sale of clothing and a variety of souvenirs. Its website also uses the title (http://www.tokillamockingbird.com ) without any compensation, the suit says.
"Ms. Lee has suffered a stroke and is in ill health. The defendant apparently believes that she lacks the desire to police her trademarks, and therefore seeks to take advantage of Ms. Lee's condition and property. The defendant is mistaken," the suit says.
The suit says that in August, the museum refused an offer from Lee to sell it merchandise she had authorized.
Clay Rankin, the attorney representing the 87-year-old author, did not respond to requests for comment Friday.
The museum's attorney said the tourist attraction is within its rights to educate the public and preserve the area's history.
"It's sad that Harper Lee's handlers have seen fit to attack the nonprofit museum in her hometown that has been honoring her and the town's rich history associated with that legacy for over 20 years," Goforth said.
The suit says the museum took in more than $500,000 in revenue in 2012. Goforth said the museum earned $28,566 from merchandise sales in 2012.
U.S. District Judge William Steele has not scheduled any hearings in the case.