David Gerard writes "Bertelsmann is to publish a single-volume book of the German Wikipedia in cooperation with Wikimedia Deutschland. It will cost 20 Euros, and 1 Euro from each copy will go to Wikimedia. They're editing down the most popular 50,000 articles for the 1,000-page book, to be released in September. Because of the open-source origin of the material, the publisher cannot claim copyright in the book." The German-language Wikipedia is second in size only to the English version, which has 2.3 million articles.