Is an OSI-compliant license a requirement for all third-party code redistributed by Eclipse projects?
Eclipse fully supports the Open Source Initiative’s certification of open source licenses, and the Eclipse Public License is certified as such. However, there are licenses for software content which meet Eclipse’s requirements for compatibility with the EPL and downstream commercial re-distribution that are not OSI certified, and Eclipse projects may make use of such licenses after review and approval by the Eclipse Foundation. The reverse is also true: there are OSI-compliant licenses are not compatible with the EPL or do not permit downstream commercial re-distribution. Such licenses are not used by Eclipse projects.