# Nordic library data licences

Each track in this library keeps the licence of its source. The `s` field of every row in
`index.json` names the source; `index.json.sources` lists the licence and attribution.

- `osm`: © OpenStreetMap contributors, Open Database License (ODbL 1.0), via the OpenSnowMap piste
  extract. https://www.openstreetmap.org/copyright
- `c2c`: route geometry and names from Camptocamp.org collaborative route documents,
  © Camptocamp.org contributors. Collaborative content is CC BY-SA; its geographic coordinates are
  dual-licensed CC BY-SA / ODbL. https://www.camptocamp.org
- `kartverket`: marked winter ski routes from Turrutebasen, © Kartverket, CC BY 4.0
  ("Inneholder data fra Turrutebasen, Kartverket"). https://www.kartverket.no/api-og-data/vilkar-for-bruk
- `nvv`: ski and winter trails (skidleder and vinterleder, including the state fjälleder) from
  Naturvårdsverket "Leder och friluftsanordningar", CC0 1.0 (credit: © Naturvårdsverket).
  https://geodata.naturvardsverket.se/nedladdning/friluftsliv/

Each record links to its original document. Keep that attribution when you reuse or export a
track. See docs/ALPS_LIBRARY.md (Nordic library section) for how the data was selected and deduplicated.