The 19th-century copyright revolution gave authors and translators powerful tools over the use of their works. It encouraged publishers to form networks that connected them to writers, translators, authors' societies, and literary agents worldwide. This book argues that the development of international frameworks for the protection of literary property represented a watershed in the transnational circulation of texts in translation. Through the lens of the post-Unification Italian translation market of British and US authors (1900-1947), it combines a copyright historical approach to book history with a systematic survey of British and Italian archives. It positions the Italian publishing industry within the broader European and transatlantic copyright market to explore the cultural, social, and political value of translation rights, offering a new interpretative key to the transnational nature of the modern book trade.