CNPIEC digital printing combines variable data printing technology with Internet technology and cloud computing technology to form an innovative two-dimensional code with digital identification of paper and electricity on publications. It is different from the common fixed two-dimensional code link. The combination of technology can easily distinguish the authenticity from the fake, and at the same time certifies the readers of genuine books, allowing genuine readers to obtain exclusive electronic versions or online content, and giving them exclusive rights in the interactive community, gradually forming readers and authors. mode of interaction.