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. While these legal proceedings have countered a number of cases of outright piracy, other attempts have targeted not-for-profit endeavours and have been criticised as too draconian. Another area of legal dispute involves a series of injunctions obtained by Rowling and her publishers to prohibit anyone from reading her books before their official release dates. The sweeping powers of these injunctions have occasionally drawn fire from civil liberties and free speech campaigners and sparked debates over the "right to read".