Open-source notices
Last updated: 3 September 2026
CivilOS is built on open-source software. This page names each component we distribute to your browser, the licence it is used under, and where its source code can be obtained. We are grateful to the people who wrote it.
GNU LibreDWG — GPL-3.0
When you open a .dwg drawing, CivilOS sends your browser a WebAssembly build of
GNU LibreDWG. That component is free software licensed under the
GNU General Public License, version 3, and it is not covered by the
CivilOS terms that apply to the rest of the platform.
| Component | @mlightcad/libredwg-web version 0.7.8, an unmodified WebAssembly build of GNU LibreDWG |
| Served from | https://civilos.in/wasm/libredwg-web.wasm |
| Licence | GNU General Public License v3.0 or later — full text at gnu.org |
| Copyright | Free Software Foundation, Inc. and the GNU LibreDWG contributors |
| Upstream source | GNU LibreDWG — savannah.gnu.org/projects/libredwg WebAssembly packaging — github.com/mlightcad/libredwg-web |
Written offer for the Corresponding Source
In accordance with sections 4 and 6 of the GPL-3.0, the complete corresponding source code for the LibreDWG build distributed by CivilOS is available from the upstream projects linked above. If you would prefer to receive it directly from us, write to info@civilos.in and we will supply it, on a physical medium or by download, for no more than our cost of doing so. This offer is valid for as long as we distribute the component, and for at least three years afterwards.
No warranty
GNU LibreDWG is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for details.
You may redistribute and modify GNU LibreDWG under the terms of the GPL-3.0. Nothing on this page limits the rights that licence gives you.
Everything else
The remaining components CivilOS depends on are distributed under permissive licences. Their copyright notices and licence texts travel with the packages themselves and are reproduced in full at the links below.
| Component | Version | Licence |
|---|---|---|
| React & React DOM | 18.3.1 | MIT |
| three.js | 0.185.1 | MIT |
| Express | 4.22.2 | MIT |
| Anthropic SDK | 0.94.0 | MIT |
PDF.js (pdfjs-dist) | 6.2.108 | Apache-2.0 |
SheetJS (xlsx) | 0.20.3 | Apache-2.0 |
| Leaflet | 1.9.4 | BSD-2-Clause |
| dotenv | 16.6.1 | BSD-2-Clause |
| Lucide icons | 0.468.0 | ISC |
Map and data services
The GIS module draws map tiles from third-party services, each under its own terms: OpenStreetMap contributors (ODbL), Esri, CARTO and OpenTopoMap (CC-BY-SA). The CPWD Delhi Schedule of Rates 2023 is a publication of the Central Public Works Department, Government of India, and is reproduced as published.
Something missing?
If you believe a component is used here without proper attribution, please tell us at info@civilos.in and we will correct it.
See also our Terms of Use and Privacy Policy.