Free and open source software projects live on the web—even projects that don’t build web applications use software repositories, forums, social networks, project management software, and other online tools to engage developers. But with user engagement comes a certain amount of risk: if a user posts copyright-infringing content to a project’s site, the project could find itself threatened with a lawsuit for hosting the content. A compliant DMCA policy gives the project a ready defense to claims related to user activity. Without one, even a bogus claim could cost the project significantly more time and legal expense.