The Harry Potter Lexicon "the will or the heart" to now publish her own encyclopedia. On 8 September 2008, Rowling won her copyright case against RDR Books. Lexicon publisher RDR Books said: Judge Patterson said that reference materials were generally useful to the public but that in this case, Vander Ark went too far. He said that "while the Lexicon, in its current state, is not a fair use of the Harry Potter works, reference works that share the Lexicon's purpose of aiding readers of literature generally should be encouraged rather than stifled." He said he ruled in Ms. Rowling's favor because the "Lexicon
J. K. Rowling working as a researcher and bilingual secretary for Amnesty International when she conceived the idea for the "Harry Potter" series while on a delayed train from Manchester to London in 1990. The seven-year period that followed saw the death of her mother, birth of her first child, divorce from her first husband and relative poverty until the first novel in the series, "Harry Potter and the Philosopher's Stone", was published in 1997. There were six sequels, of which the last, "Harry Potter and the Deathly Hallows", was released in 2007. Since then, Rowling has written five books for adult readers: