Richard Stallman made extensive revisions and annotations to the original text. As the book was published under the GFDL, it enabled Stallman to address factual errors and clarify some of the Williams's mistaken or incoherent statements, bringing in his first-hand experiences and technical expertise where appropriate. This new revised edition Free as in Freedom 2.0 was published by GNU Press in October 2010 and is available at FSF online shop and as a free PDF download. Sam Williams wrote a new foreword for the revised edition. See also Free software Free Software, Free Society, selected essays by Stallman References External links Free as in Freedom listing at O'Reilly Media 2002 non-fiction books American biographies Books about free software Copyleft media O'Reilly Media books Books about computer hacking Works about computer hacking