Open-source licences

Last updated 27 July 2026

Blackbird is built on work other people gave away. This page lists it. Each project is used under its own licence; follow a link for the full text and the copyright notice that goes with it.

In the Android app

• AndroidX — core, appcompat, activity, fragment, lifecycle, constraintlayout, recyclerview, biometric, work, room, media3 — Apache License 2.0
• Material Components for Android — Apache License 2.0
• Kotlin and kotlinx.coroutines — Apache License 2.0
• OkHttp — Apache License 2.0
• Glide — BSD, MIT and Apache 2.0
• JSON in Java (org.json) — Public Domain

On this site

Five typefaces are served from this domain rather than a font CDN, so loading a page here contacts nobody else. All are under the SIL Open Font License 1.1; the licence text and every copyright notice ship alongside them at /assets/fonts/OFL.txt.

• Cinzel and Cinzel Decorative — Natanael Gama
• Playfair Display — Claus Eggers Sørensen
• EB Garamond — Octavio Pardo, Georg Duffner
• Bodoni Moda — indestructible type*

In the server

• Go and golang.org/x/crypto — BSD 3-Clause
• chi — MIT
• coder/websocket — ISC
• pgx — MIT
• golang-migrate — MIT
• golang-jwt — MIT
• godotenv — MIT
• go-redis — BSD 2-Clause
• MinIO Go client — Apache License 2.0
• Protocol Buffers for Go — BSD 3-Clause
• PostgreSQL — PostgreSQL Licence
• Redis — RSALv2 / SSPLv1
• Caddy — Apache License 2.0
• coturn — BSD 3-Clause

Licence texts

• Apache License 2.0
• MIT License
• BSD 3-Clause
• BSD 2-Clause
• ISC License
• PostgreSQL Licence

Something missing or credited wrongly? Tell me and it gets fixed: buildsevaa@gmail.com