Derdja is licensed under the SIL Open Font License, Version 1.1. This license is copied below, and is also available with a FAQ at http://scripts.sil.org/OFL
Disclaimer The documentation is not libre nor open-source. All Walid Boubouchi drawing are proprietary and under his copyright.
This font repository follows the Unified Font Repository v2.0, a standard way to organize font project source files. Learn more at https://github.com/raphaelbastide/Unified-Font-Repository