In Eclipse Lyo, some of the software modules are not always tightly linked to the rest of the Eclipse projects which concern running within the IDE on the desktop.
For such libraries, there is the need to make sure that their license is flexible enough to accommodate most situations. Thus, in addition to the EPL licensing which is common in Eclipse project, such code will be also released under the conditions of the EDL (New BSD style license).
Other parts of Eclipse Lyo may be licensed only under the EPL, as per the author's choice. Though EDL is the recommended license.