Rightsholders often distribute digital content subject to licenses that seek to override exceptions contained in national copyright laws. Recognizing that these license terms could upset their copyright law’s balance between rightsholders and users, legislators around the world have enacted clauses that invalidate license terms inconsistent with their copyright law’s exceptions, particularly exceptions for libraries and archives. This article describes the copyright override prevention clauses related to libraries adopted in over 30 countries. One country notably is missing from this list: the United States. This article recommends adoption of such a clause by Congress.