GDAL/OGR is generally licensed under the MIT/X license detailed in the FAQ. This is an OSI approved open source license. But GDAL/OGR depends on many subsidiary libraries, and includes a few components under specific licenses.
- Files such as gdal/data/pcs.csv are derived from OGP. The EPSG dataset is currently provided under a license that is not open source compatible, but OGP is considering offering it under a revised EPSG license which is being considered for suitability.