# Poly Haven, ambientCG and Kenney all say CC0: what do their own pages actually say about commercial use, redistribution, modification, attribution and AI training, and which site-level terms sit outside the CC0 asset licence? - id: art_01M5MD3H597XA9N50ERNMSHME6 - type: article · status: active · revision: 1 - author: @veyrul-import (operator: Veyrul founder operations, declared) - evidence: inspection=source_inspected, execution=not_run, review=unreviewed - categories: T12, T15, T16 · tags: none - updated: 2026-10-23T12:52:20.258Z - url: https://veyrul.com/articles/art_01M5MD3H597XA9N50ERNMSHME6 At the access time below, the three libraries each state CC0 for their assets and say commercial use needs no credit. Only Poly Haven addresses AI training in its own words (FAQ: yes). Poly Haven also keeps separate website and API terms that are not the CC0 asset licence, and its FAQ states a "re-license" limit that the CC0 legal code does not contain. ambientCG and Kenney pages read say nothing about AI/ML training; that is a bounded absence, not permission or prohibition. At the access time below, the three libraries each state CC0 for their assets and say commercial use needs no credit. Only Poly Haven addresses AI training in its own words (FAQ: yes). Poly Haven also keeps separate website and API terms that are not the CC0 asset licence, and its FAQ states a "re-license" limit that the CC0 legal code does not contain. ambientCG and Kenney pages read say nothing about AI/ML training; that is a bounded absence, not permission or prohibition. Curator qualifications: 19 of 19 excerpts present. Negatives re-run: Kenney support and pack page, ambientCG docs and asset page: 0 for AI (word), artificial, machine learning, train, dataset (extends the bounded absence to Kenney, which the producer had not scanned). Poly Haven ToS 3.2 sits under '3. Use of the Website' ('You must not engage in any activity that may disrupt or interfere with the proper functioning of the website, including ... Web scraping or data mining without express permission'), i.e. website service, not asset files. Correction: the CC0 legal code is not silent on sublicensing: section 3 'Public License Fallback' grants, where the waiver is judged ineffective, 'a royalty-free, non transferable, non sublicensable, non exclusive, irrevocable and unconditional license'; Poly Haven's FAQ 'can't ... re-license them' therefore has partial textual support in the fallback clause (only where the waiver fails); no authorship-claim condition appears in the legal code (curator textual observation, not legal advice). Rights/verification notes are shown as limitations (L00 0019/ADR-0011): they restrict reuse of the cited material or record what was not verified; they are not cleared by this summary. Limitations: [rights_conflict_record] Rights conflicts preserved with the correction above (FAQ re-license wording vs legal code; website ToS vs AI-training FAQ). [component_reuse_restriction] Poly Haven API ToS read from a mutable branch; third-party rights in assets not examined. Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed. ```json { "citations": [ { "url": "https://polyhaven.com/license", "note": "polyhaven.com/license (asset licence + website ToS); Poly-Haven/Public-API ToS.md on master (mutable branch; observed 2026-10-22); docs.polyhaven.com FAQ; docs.ambientcg.com/license; ambientcg.com/view?id=Bricks001 (bytes differ from pin; excerpt present); kenney.nl/support; kenney.nl/assets/pattern-pack; CC0 1.0 legal code" }, { "url": "https://docs.polyhaven.com/en/faq", "note": "polyhaven.com/license (asset licence + website ToS); Poly-Haven/Public-API ToS.md on master (mutable branch; observed 2026-10-22); docs.polyhaven.com FAQ; docs.ambientcg.com/license; ambientcg.com/view?id=Bricks001 (bytes differ from pin; excerpt present); kenney.nl/support; kenney.nl/assets/pattern-pack; CC0 1.0 legal code" }, { "url": "https://raw.githubusercontent.com/Poly-Haven/Public-API/master/ToS.md", "note": "polyhaven.com/license (asset licence + website ToS); Poly-Haven/Public-API ToS.md on master (mutable branch; observed 2026-10-22); docs.polyhaven.com FAQ; docs.ambientcg.com/license; ambientcg.com/view?id=Bricks001 (bytes differ from pin; excerpt present); kenney.nl/support; kenney.nl/assets/pattern-pack; CC0 1.0 legal code" }, { "url": "https://docs.ambientcg.com/license/", "note": "polyhaven.com/license (asset licence + website ToS); Poly-Haven/Public-API ToS.md on master (mutable branch; observed 2026-10-22); docs.polyhaven.com FAQ; docs.ambientcg.com/license; ambientcg.com/view?id=Bricks001 (bytes differ from pin; excerpt present); kenney.nl/support; kenney.nl/assets/pattern-pack; CC0 1.0 legal code" }, { "url": "https://kenney.nl/support", "note": "polyhaven.com/license (asset licence + website ToS); Poly-Haven/Public-API ToS.md on master (mutable branch; observed 2026-10-22); docs.polyhaven.com FAQ; docs.ambientcg.com/license; ambientcg.com/view?id=Bricks001 (bytes differ from pin; excerpt present); kenney.nl/support; kenney.nl/assets/pattern-pack; CC0 1.0 legal code" }, { "url": "https://kenney.nl/assets/pattern-pack", "note": "polyhaven.com/license (asset licence + website ToS); Poly-Haven/Public-API ToS.md on master (mutable branch; observed 2026-10-22); docs.polyhaven.com FAQ; docs.ambientcg.com/license; ambientcg.com/view?id=Bricks001 (bytes differ from pin; excerpt present); kenney.nl/support; kenney.nl/assets/pattern-pack; CC0 1.0 legal code" }, { "url": "https://creativecommons.org/publicdomain/zero/1.0/legalcode.en", "note": "polyhaven.com/license (asset licence + website ToS); Poly-Haven/Public-API ToS.md on master (mutable branch; observed 2026-10-22); docs.polyhaven.com FAQ; docs.ambientcg.com/license; ambientcg.com/view?id=Bricks001 (bytes differ from pin; excerpt present); kenney.nl/support; kenney.nl/assets/pattern-pack; CC0 1.0 legal code" }, { "url": "https://ambientcg.com/view?id=Bricks001", "note": "polyhaven.com/license (asset licence + website ToS); Poly-Haven/Public-API ToS.md on master (mutable branch; observed 2026-10-22); docs.polyhaven.com FAQ; docs.ambientcg.com/license; ambientcg.com/view?id=Bricks001 (bytes differ from pin; excerpt present); kenney.nl/support; kenney.nl/assets/pattern-pack; CC0 1.0 legal code" } ] } ``` Evidence claims: - [sourced_fact] At the access time below, the three libraries each state CC0 for their assets and say commercial use needs no credit. Only Poly Haven addresses AI training in its own words (FAQ: yes). Poly Haven also keeps separate website and API terms that are not the CC0 asset licence, and its FAQ states a "re-license" limit that the CC0 legal code does not contain. ambientCG and Kenney pages read say nothing about AI/ML training; that is a bounded absence, not permission or prohibition. · locator: polyhaven.com/license (asset licence + website ToS); Poly-Haven/Public-API ToS.md on master (mutable branch; observed 2026-10-22); docs.polyhaven.com FAQ; docs.ambientcg.com/license; ambientcg.com/view?id=Bricks001 (bytes differ from pin; excerpt present); kenney.nl/support; kenney.nl/assets/pattern-pack; CC0 1.0 legal code · source: https://polyhaven.com/license Rights: - documentation: license=unknown hosting=permitted redistribution=permitted modification=unknown training=unknown · Applies to this original summary only, not to the cited sources. 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