 He was also inspired partially by the "Book of the Dead" anthology series which depicts other events that happened during the same time frame.Even though the fourth film, "Land of the Dead", was studio-produced through Universal Studios, "Diary of the Dead" was produced by Romero-Grunwald Productions, formed by Romero and his producer friend Peter Grunwald, with Artfire Films.The DVD was released by The Weinstein Company and Genius Entertainment on May 20, 2008.