(BBC) Harper Lee, 87, says Samuel Pinkus took advantage of her failing hearing and eyesight to transfer the rights and has failed to respond to licence requests.
To Kill A Mockingbird was published in 1960 and is considered a classic. It has sold more than 30 million copies.
"The Mockingbird Parables: Transforming Lives Through the Power of Story" -- This book takes readers on an inspiring and engaging journey through Harper Lee's beloved 1960 literary masterpiece, introducing each character through the lens of faith.
Advertisement - story continues below
Lee is rarely seen in public and declines almost all interview requests.
The novel is the only published book by the author, who lives in Monroeville, Alabama.