In Technische Universität Darmstadt v. Eugen Ulmer KG, the Court of Justice of the European Union (ECJ or Court) addressed several important copyright issues stemming from a practice that continues to confound many legal practitioners and adjudicators: the mass digitization of library collections. The judgment adds to an emerging body of jurisprudence decided in the context of a trend toward greater digitization that could ultimately facilitate the development of a global, digital library. To date, the jurisprudence has largely been formed by cases challenging mass digitization that are percolating through the United States courts and have attracted international attention and criticism. The ECJ decision thus provides an important point of reference for evaluating how different jurisdictions balance the rights of authors against the public interest, as served by relevant fair use exceptions consistent with their international obligations under traditional copyright treaties, the 1996 WIPO Copyright Treaty, and the 1994 Agreement on Trade-Related Aspects of Intellectual Property Rights (TRIPs) applicable to all WTO member states.