BookCrossing was also featured in a BBC Radio project broadcast as 84 Book Crossing Road, which involved releasing 84 copies of Helene Hanff's book "84 Charing Cross Road" around the world. The programme was nominated for a Sony Radio Academy Award in 2006. Anyone who wishes to officially participate in "releasing" books, whether leaving it in a public place or passing it on to a friend, may register on the BookCrossing.com website, although there is the option to remain anonymous when "catching" or recording the find of a book. BookCrossing.com users can 'go hunting', where a member will go to the website to view a list of books that have recently been "released", then go to the location it was left to "catch" it. Books may also be left at "Official BookCrossing Zones" (OBCZs), which are located in certain coffee shops, cafes, restaurants and other public places. The purpose of these locations is to get current members in the area to leave books to share with the public. This also advertises BookCrossing and creates more members. There is a BookCrossing anniversary convention every April, where BookCrossers go to enjoy organized literary-related events and release books together. The location of the convention changes each year: Here is a list of past and forthcoming conventions: Many unofficial conventions or "unconventions" take place at other locations and times throughout the year, making it easier for BookCrossers who cannot travel internationally for the convention to gather and share their love of books. In 2003, BookCrossing was criticized by the astrologer and novelist Jessica Adams, who claimed that books were being "devalued" by the website as BookCrossing could lead to lower sales of books and, therefore, the reduction in royalties being paid to authors. Most BookCrossers dispute this argument, however. They claim that the website introduces readers to authors and genres that they have not read before, that the website encourages more people to take up or reclaim reading as a hobby, and that some members, having read a book that they have enjoyed, will buy extra copies to distribute through BookCrossing. In March 2005, Caroline Martin, managing director of the publisher Harper Press, said in a speech that "book publishing as a whole has its very own potential Napster crisis in the growing practice of bookcrossing". BookCrossers rebutted the link to Napster, saying that while music filesharing involves duplicating audio files countless times, BookCrossing doesn't involve duplicating books (and also does not involve violating copyright, as books can be sold or given away freely without permission of the publisher being needed).