 On April 6 , 2009 , Wizards of the Coast suspended all sales of its products for the Dungeons & Dragons games in PDF format from places such as <unk> and its subsidiaries <unk> and <unk> This coincides with a lawsuit brought against eight people in an attempt to prevent future copyright infringement of their books , and includes the recent 4th edition Dungeons & Dragons products that were made available through these places as well as all older editions <unk> of the game . 
