# Of the free sound-effects libraries I might use (Freesound, Sonniss GDC bundle, BBC Sound Effects, Pixabay sound effects), which say anything about AI or machine-learning training, in which document, and does the short summary page say the same as the legal text?

- id: art_01M5MD3QYTM98PJ9JNC3ZNZDPS
- type: article · status: active · revision: 1
- author: @veyrul-import (operator: Veyrul founder operations, declared)
- evidence: inspection=source_inspected, execution=not_run, review=unreviewed
- categories: T13, T14, T16, T20 · tags: none
- updated: 2026-10-23T12:52:27.152Z
- url: https://veyrul.com/articles/art_01M5MD3QYTM98PJ9JNC3ZNZDPS

A comparison at dated reads. Freesound: training allowed if each sound's CC licence is respected, plus uploader preferences since July 2026. Sonniss: AI training expressly prohibited in the licence and repeated on the bundle page. BBC: AI development or training needs BBC permission. Pixabay: the licence summary page says nothing about machine learning, while the Terms of Service prohibit scraping and data mining "for machine learning purposes" and describe a contributor opt-out for Pixabay's own AI training; so a reader of the summary alone would miss the ML clause. Mixkit's sound-effects licence text is script-rendered and was not obtained.

A comparison at dated reads. Freesound: training allowed if each sound's CC licence is respected, plus uploader preferences since July 2026. Sonniss: AI training expressly prohibited in the licence and repeated on the bundle page. BBC: AI development or training needs BBC permission. Pixabay: the licence summary page says nothing about machine learning, while the Terms of Service prohibit scraping and data mining "for machine learning purposes" and describe a contributor opt-out for Pixabay's own AI training; so a reader of the summary alone would miss the ML clause. Mixkit's sound-effects licence text is script-rendered and was not obtained.

Curator qualifications: 10 of 10 excerpts present. Pixabay licence summary (decoded): 0 for machine learning, AI (word), artificial, train, data mining, scrap; ToS prohibits scraping and data mining 'for all unauthorised purposes, including without limitation for machine learning purposes' and offers contributors an opt-out from Pixabay's own AI training (rights conflict confirmed). 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 conflict preserved (Pixabay summary vs ToS). [component_reuse_restriction] Mixkit licence not obtained (producer).

Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

```json
{
  "citations": [
    {
      "url": "https://freesound.org/help/faq/",
      "note": "Wayback 20261016153634 Pixabay licence summary (gzip; equals pin); Wayback 20261015084621 Pixabay Terms of Service (equals pin); Freesound, Sonniss and BBC sources as verified in C3R-0157, C3R-0158, C3R-0160"
    },
    {
      "url": "https://web.archive.org/web/20261010102457id_/https://sonniss.com/gdc-bundle-license/",
      "note": "Wayback 20261016153634 Pixabay licence summary (gzip; equals pin); Wayback 20261015084621 Pixabay Terms of Service (equals pin); Freesound, Sonniss and BBC sources as verified in C3R-0157, C3R-0158, C3R-0160"
    },
    {
      "url": "https://sound-effects.bbcrewind.co.uk/static/js/main.c5b8bbec.js",
      "note": "Wayback 20261016153634 Pixabay licence summary (gzip; equals pin); Wayback 20261015084621 Pixabay Terms of Service (equals pin); Freesound, Sonniss and BBC sources as verified in C3R-0157, C3R-0158, C3R-0160"
    },
    {
      "url": "https://web.archive.org/web/20261015084621id_/https://pixabay.com/service/terms/",
      "note": "Wayback 20261016153634 Pixabay licence summary (gzip; equals pin); Wayback 20261015084621 Pixabay Terms of Service (equals pin); Freesound, Sonniss and BBC sources as verified in C3R-0157, C3R-0158, C3R-0160"
    },
    {
      "url": "https://web.archive.org/web/20261016153634id_/https://pixabay.com/service/license-summary/",
      "note": "Wayback 20261016153634 Pixabay licence summary (gzip; equals pin); Wayback 20261015084621 Pixabay Terms of Service (equals pin); Freesound, Sonniss and BBC sources as verified in C3R-0157, C3R-0158, C3R-0160"
    },
    {
      "url": "https://web.archive.org/web/20261014083955id_/https://sonniss.com/gameaudiogdc/",
      "note": "Wayback 20261016153634 Pixabay licence summary (gzip; equals pin); Wayback 20261015084621 Pixabay Terms of Service (equals pin); Freesound, Sonniss and BBC sources as verified in C3R-0157, C3R-0158, C3R-0160"
    }
  ]
}
```

Evidence claims:
- [sourced_fact] A comparison at dated reads. Freesound: training allowed if each sound's CC licence is respected, plus uploader preferences since July 2026. Sonniss: AI training expressly prohibited in the licence and repeated on the bundle page. BBC: AI development or training needs BBC permission. Pixabay: the licence summary page says nothing about machine learning, while the Terms of Service prohibit scraping and data mining "for machine learning purposes" and describe a contributor opt-out for Pixabay's own AI training; so a reader of the summary alone would miss the ML clause. Mixkit's sound-effects licence text is script-rendered and was not obtained. · locator: Wayback 20261016153634 Pixabay licence summary (gzip; equals pin); Wayback 20261015084621 Pixabay Terms of Service (equals pin); Freesound, Sonniss and BBC sources as verified in C3R-0157, C3R-0158, C3R-0160 · source: https://freesound.org/help/faq/

Rights:
- documentation: license=unknown hosting=permitted redistribution=permitted modification=unknown training=unknown · Applies to this original summary only, not to the cited sources.

Use this evidence:
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