This document summarizes the work of the Modernist Archives Publishing Project (MAPP) and their copyright workstream. MAPP is a collaboration between several universities and cultural institutions to make archival materials freely available online. The copyright workstream led by Helena Clarkson of the University of Reading is responsible for clearing copyrights on the archival content. The summary discusses Clarkson's process of researching and contacting copyright holders, building flexibility into workflows, managing risks and relationships, and lessons learned from the project.