Different components of Poky are under different licenses (a mix of MIT and GPLv2). Please see: bitbake/COPYING (GPLv2) meta/COPYING.MIT (MIT) meta-extras/COPYING.MIT (MIT) which cover the components in those subdirectories. This means all metadata is MIT licensed unless otherwise stated. Source code included in tree for individual recipes is under the LICENSE stated in the .bb file for those software projects unless otherwise stated. License information for any other files is either explicitly stated or defaults to GPL version 2.