Take legal responsibility. Official website of Wan Wei Co., Ltd. shows that Wan Wei black and white volumes cannot be copied, so copying infringes on the rights of others, which is illegal. So you have to bear legal responsibility. Wan Wei Black-and-White Paper is a "black-and-white paper" for the senior high school entrance examination made by Ren Qian Research Institute of Wan Wei in conjunction with the first-line teachers in China, which has been selling well for 10 year.