Licensed components
Opus includes components that integrate third-party open-source software, hosted services, or externally licensed data. This page records those dependencies and the obligations that apply when an Opus component is shipped.
This is a practical engineering summary, not legal advice. Check the linked licence and service terms before releasing a product, especially if you replace the default provider or redistribute data.
Map
The Opus Map component is an Opus React interface and visual treatment built on the following third-party layers.
| Layer | Used by Opus | Licence or policy | What consumers must do |
|---|---|---|---|
| MapLibre GL JS | Browser map renderer | BSD 3-Clause | Retain the copyright notice, licence conditions, and disclaimer in source distributions or accompanying materials for binary distributions. Do not imply endorsement by MapLibre or its contributors. |
| OpenFreeMap | Default hosted styles and vector tiles | MIT project licence and OpenFreeMap attribution terms | Attribute the map as described by OpenFreeMap. The hosted public service is provided without an SLA; review its terms of service before production use. |
| OpenMapTiles | Vector-tile schema and styles used by OpenFreeMap | Open-source licences listed by OpenFreeMap/OpenMapTiles | Include © OpenMapTiles in the map attribution when using the default OpenFreeMap styles. |
| OpenStreetMap | Underlying map and geocoding data | Open Data Commons Open Database Licence 1.0 | Credit OpenStreetMap and make clear that its data is available under ODbL. ODbL share-alike requirements can apply when a derived database is publicly used or distributed. |
| Nominatim | Default reverse-geocoding and submitted place-search service | Nominatim public API usage policy and OpenStreetMap ODbL data | Display suitable attribution, cache results, avoid heavy or systematic use, keep below the stated request limit, and be able to change provider. The public endpoint is not a production SLA. |
Required default-map attribution
When the default OpenFreeMap styles and OpenStreetMap data are used, display:
OpenFreeMap © OpenMapTiles Data from OpenStreetMap
Link OpenStreetMap to its copyright and licence page.
The showAttribution prop controls MapLibre's visible attribution control. Turning that control off does not remove the licence obligation. If showAttribution={false}, provide the required credit next to the map, in an application-wide licences screen, or through another presentation allowed by the applicable attribution guidance.
Geocoding and search
The bundled Nominatim provider is suitable for Opus demonstrations and moderate, user-triggered evaluation. Place search only runs when the user submits a query; it does not implement autocomplete.
Before production deployment, make a deliberate provider decision:
- review the current Nominatim usage policy;
- use a proxy or a provider account where appropriate;
- cache results and avoid repeated queries;
- do not send personal, confidential, or sensitive text;
- supply a custom
searchPlacesandreverseGeocodeimplementation when the public endpoint is unsuitable; - retain OpenStreetMap attribution when the returned data is sourced from OpenStreetMap.
Disable either integration with searchPlaces={false} or reverseGeocode={false}.
Replacing providers
The Map component accepts custom styleUrl, lightStyleUrl, darkStyleUrl, searchPlaces, and reverseGeocode providers. Replacing a provider also replaces its licence, attribution, privacy, usage-limit, and commercial terms. Record the new provider on this page before release.
Component ownership
Opus owns the React composition, accessibility structure, theme integration, hotspot panel, coordinate display, and Opus-specific styling. Opus does not claim ownership of MapLibre, OpenFreeMap, OpenMapTiles, OpenStreetMap data, or Nominatim.