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CC0 forever; attribution-free but warmly encouraged.
We publish under CC0-1.0 by default. You owe no attribution legally — your downstream is free. But substrate-honest attribution is encouraged. This guide names the recommended forms.
Recommended footer string: 'Catalog and price data from Cambridge TCG (https://cambridgetcg.com) — CC0-1.0.' Link the URL. We don't require it; we appreciate it. Helps users find the source of truth.
If your downstream is also an API, attach per-record provenance: `provenance: { upstream: 'cambridge-tcg', upstream_url: 'https://cambridgetcg.com', license: 'CC0-1.0', retrieved_at: '...' }`. Better: implement your own `_meta.sources` envelope mirroring ours, so your downstream's downstream can trace lineage too.
If you publish HTML, add schema.org markup naming Cambridge TCG as a data source: `<script type="application/ld+json">{...}</script>` with `Dataset` + `provider` + `license` properties.
Our default license is CC0. But some endpoints carry upstream license constraints. Watch `_meta.source_license` — values like 'internal-only' mean you cannot bulk-re-export. The /api/v1/cards/[sku]/cardrush-history endpoint (CardRush JPY observations) is internal-only.