imagery-index data files are available under the CC BY-SA 3.0.
imagery-index build scripts are available separately under the ISC License. See the scripts/LICENSE.md file for more details.
A list of past contributors can be found at: https://josm.openstreetmap.de/wiki/Maps?action=history https://github.com/osmlab/editor-layer-index/graphs/contributors