This Oct. 28, 2008, file photo shows Liu Xiaobo, right, reading a letter beside the grave of Bao Zunxin, a Chinese historian and political dissident who was arrested and jailed for his role in the 1989 Tiananmen Square democracy protests in Beijing, China. Mr. Liu won the 2010 Nobel Peace Prize on Friday Oct. 8, 2010. (AP Photo, File)

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This Oct. 28, 2008, file photo shows Liu Xiaobo, right, reading a letter beside the grave of Bao Zunxin, a Chinese historian and political dissident who was arrested and jailed for his role in the 1989 Tiananmen Square democracy protests in Beijing, China. Mr. Liu won the 2010 Nobel Peace Prize on Friday Oct. 8, 2010. (AP Photo, File)