Acknowledgements
Last updated: 11 October 2026
1. Location data
IP Geolocation by DB-IP. We use the free DB-IP Lite database, licensed under the Creative Commons Attribution 4.0 International licence, on our own servers to show prices in your local currency.
2. Fonts
- IBM Plex Sans and IBM Plex Mono, by IBM, under the SIL Open Font License 1.1.
- Source Serif 4, by Adobe, under the SIL Open Font License 1.1.
The fonts are served from our own servers.
3. Open-source software
CurTask is built on the work of many open-source projects. The main ones are:
| Software | Licence |
|---|---|
| React | MIT |
| React Aria (Adobe) | Apache 2.0 |
| Tiptap and ProseMirror | MIT |
| Yjs and Hocuspocus | MIT |
| citeproc-js | CPAL 1.0 / AGPL 3.0 (dual) |
| Citation Style Language styles and locales | CC BY-SA 3.0 |
| PDF.js (Mozilla) | Apache 2.0 |
| PaddleOCR and its PP-OCR models | Apache 2.0 |
| ONNX Runtime (Microsoft) | MIT |
| Mammoth | BSD 2-Clause |
| markdown-it | MIT |
| Fastify | MIT |
| PostgreSQL | PostgreSQL Licence |
| Supabase | Apache 2.0 |
| pg-boss | MIT |
| qpdf | Apache 2.0 |
| Ghostscript (used on our servers only) | AGPL 3.0 |
| ClamAV (used on our servers only) | GPL 2.0 |
| COBE (Shu Ding) | MIT |
| world-atlas (Mike Bostock), with Natural Earth data | ISC; data in the public domain |
| i18n-iso-countries | MIT |
We are grateful to everyone who maintains them.
4. Research data
- Bibliographic data from OpenAlex, released under CC0.
- Search results from Semantic Scholar, provided by the Allen Institute for AI under the Semantic Scholar API licence.
5. Licence texts
The full licence texts and the complete list of components are available on request at hello@hackedu.tech.