This chapter traces how the Chinese booksellers in the Chessboard Street neighborhood utilized the tradition of merchant guilds and the Qing government's reform initiative to create their quasi-legal institution in order to regulate and protect what they believed to be banquan/copyright. It illustrates in particular how the Shanghai shuye gongsuo (SBG), a civic organization with no legal jurisdiction or official authorization, enforced its banquan/copyright regulation and punished pirates according to their ideas of morality, norms, and customs. It illustrates how the SBG's rich records not only reveal the daily operation and conflicts in the modern Chinese cultural economy, but also the booksellers' conceptions of property ownership, civility, and trust that were articulated and contested in routine transactions. The chapter also focuses on how the SBG interacted and negotiated with the state's formal legal system after the promulgation of China's first copyright law in 1911. Throughout the 1910s and 1920s, although new legislation regarding the protection of copyright appeared, it was rarely enforced in reality because consistent political upheavals had prevented the Chinese central state from establishing sufficient legal control over its territory.