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Attribution

This file is the attribution record for Ground Truth and must be reachable from the game's title screen (CLAUDE.md — a shipping blocker, not a nicety). Rows land here in the same commit as the ingest or adoption that creates the obligation; a section that says "none yet" is a scaffold, not a licence to defer.

Map and geographic data

• OpenStreetMap — © OpenStreetMap contributors, licensed under the Open Database License (ODbL) 1.0. In use since M0a (2026-07-30): the three greybox recognition-instrument snapshots under data/greybox/ (building footprints, heights, road centrelines via Overpass; per-file osm_base vintage recorded in each snapshot). The M0a link page credits OSM in its footer. Attribution and the share-alike question are analysed in docs/DEPLOYMENT.md §7.2.
• Ville de Montréal open data — CC BY 4.0, © Ville de Montréal. In use since M0a (2026-07-30): building heights in the greybox snapshots under data/greybox/ are derived from Bâtiments 2D (CARTO-BAT-COTE roof spot elevations, 2016) and the Modèle numérique de terrain (MNT) 2015 (ground reference), joined by tools/greybox/enrich-heights.ts. The M0a link page credits the city in its footer.

Planned, not yet ingested (first pipeline ingest: M1, docs/MILESTONES.md):

• Overture Maps Foundation — CDLA-Permissive-2.0, except OSM-derived themes, which remain ODbL (the row must say which).
• Ville de Montréal / Gouvernement du Québec open data — per-dataset terms; each ingested dataset gets its own row with source URL, licence, and vintage date.

The pinned data snapshot (data_hash) and per-source vintages are recorded in data/cities/<slug>/ manifests from M1; this file carries the human-readable credit lines.

Software

Third-party code licences are recorded in DEPENDENCIES.md (the ledger the Layer 0 licence gate enforces). Notice text ships with every build: pnpm build emits THIRD-PARTY-NOTICES.html into dist/ (packages/client/scripts/emit-notices.ts), linked from the landing-page footer, and check-dist.ts fails any build where the page or its expected texts are missing. Shipped third-party code as of M0b:

• three.js — MIT, © three.js authors.
• Rapier (@dimforge/rapier3d-compat) — Apache-2.0, © Dimforge. The npm package carries no licence file, so the canonical Apache-2.0 text is committed at packages/client/scripts/licenses/apache-2.0.txt and reproduced in the notices page.
• recast-navigation-js (@recast-navigation/core, /generators, /wasm) — MIT, © Isaac Mason, for the binding layer; the Recast/Detour algorithms compiled into the WASM blob are Zlib, © Mikko Mononen (text committed at packages/client/scripts/licenses/recast-detour-zlib.txt). Both licences are reproduced, matching the double row in DEPENDENCIES.md.
• yaml — ISC, © Eemeli Aro. Ships via @ground-truth/content's runtime schema loaders.
• zod — MIT, © Colin McDonnell. Ships via @ground-truth/content and @ground-truth/protocol.

This file itself ships as attribution.html in the same build step, which is what makes it reachable from the title screen (CLAUDE.md shipping blocker) with the licence hyperlinks CC BY 4.0 §3(a)(1) asks for.

Assets

None shipped yet. A CC BY asset adopted into a shipped build (D-0064) gets its credit line here — author, work, source URL, licence + licence URI — in the same commit as the DEPENDENCIES.md row. Placeholder-tier assets under studio/ are not shipped and are credited in their archive manifests, not here.