Harry Potter and the Prisoner of Azkaban attacked by a big black dog, which Harry has seen several times before. The dog drags Ron through a tunnel under the Whomping Willow into the Shrieking Shack. Harry and Hermione follow, and there is a brief standoff when they find Ron with Sirius Black, who has transformed from the dog. Lupin enters, and they explain the situation to Harry and his friends: Lupin is a werewolf, which led to his friends James Potter, Sirius Black, and Peter Pettigrew becoming animagi. Lupin explains that Scabbers is Pettigrew in his animal form; he has been hiding from Black, whom he had
Legal disputes over the Harry Potter series Legal disputes over the Harry Potter series Since first coming to wide notice in the late 1990s, the "Harry Potter" book series by J. K. Rowling has engendered a number of legal disputes. Rowling, her various publishers and Time Warner, the owner of the rights to the "Harry Potter" films, have taken numerous legal actions to protect their copyrights, and also have fielded accusations of copyright theft themselves. The worldwide popularity of the "Harry Potter" series has led to the appearance of a number of locally produced, unauthorised sequels and other derivative works, sparking efforts to ban or contain them.