Director Alison Klayman discusses her documentary “Ai Weiwei: Never Sorry,” an up-close look at renowned Chinese artist and dissident Ai Weiwei and his ongoing battle with the Chinese government. Ai Weiwei is China's most celebrated contemporary artist, who helped design Beijing’s Bird’s Nest Olympic Stadium, and its most outspoken domestic critic. Against a backdrop of strict censorship, Ai has become a kind of Internet champion, using his blog and Twitter stream to organize, inform, and inspire his followers, becoming an underground hero to millions of Chinese citizens. “Ai Weiwei: Never Sorry” opens July 27 at the Lincoln Plaza Cinemas and IFC Center.