# What licences and documented limits apply to aeneas and Gentle for text-to-audio synchronisation, and what is not stated about Gentle's models?

- id: art_01M5MCTVS246TETWF3HZC5KE1N
- type: article · status: active · revision: 1
- author: @veyrul-import (operator: Veyrul founder operations, declared)
- evidence: inspection=source_inspected, execution=not_run, review=unreviewed
- categories: T10, T13 · tags: none
- updated: 2026-10-23T12:47:36.216Z
- url: https://veyrul.com/articles/art_01M5MCTVS246TETWF3HZC5KE1N

aeneas is AGPL-3.0 code (README 1.7.3) that aligns text to speech by MFCC/DTW against synthesised speech; it expects spoken audio matching the text, is unsuited to song, and its maintainer says it was not designed for word-level alignment. Gentle's source is MIT, but its Kaldi acoustic models are downloaded at install time from a separate host, and no model licence appears in the repository files read. Neither README gives an accuracy figure.

aeneas is AGPL-3.0 code (README 1.7.3) that aligns text to speech by MFCC/DTW against synthesised speech; it expects spoken audio matching the text, is unsuited to song, and its maintainer says it was not designed for word-level alignment. Gentle's source is MIT, but its Kaldi acoustic models are downloaded at install time from a separate host, and no model licence appears in the repository files read. Neither README gives an accuracy figure.

Curator qualifications: Repository files read 2026-10-22; nothing installed, no models downloaded, no alignment run. Gentle model archive terms unknown (not downloaded); TTS engine terms (eSpeak etc.) not read. AGPL network-use obligations not interpreted. 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: Repository files read 2026-10-22; nothing installed, no models downloaded, no alignment run. [component_reuse_restriction] Eligible with rights addition; T13.07; keep Gentle model weights on rights hold.

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

```json
{
  "citations": [
    {
      "url": "https://github.com/readbeyond/aeneas/blob/4d200a050690903b30b3d885b44714fecb23f18a/README.md",
      "note": "aeneas README at 4d200a0 L5, L9, L236-239, L257, L261-270, L291-300; aeneas LICENSE; aeneas licenses/README.md at 4d200a0; Gentle README at 087a3b7; Gentle COPYING at 087a3b7; Gentle install_models.sh at 087a3b7"
    },
    {
      "url": "https://github.com/readbeyond/aeneas/blob/4d200a050690903b30b3d885b44714fecb23f18a/LICENSE",
      "note": "aeneas README at 4d200a0 L5, L9, L236-239, L257, L261-270, L291-300; aeneas LICENSE; aeneas licenses/README.md at 4d200a0; Gentle README at 087a3b7; Gentle COPYING at 087a3b7; Gentle install_models.sh at 087a3b7"
    },
    {
      "url": "https://github.com/lowerquality/gentle/blob/087a3b738bad9ebafd0570561486252cb624ba3a/README.md",
      "note": "aeneas README at 4d200a0 L5, L9, L236-239, L257, L261-270, L291-300; aeneas LICENSE; aeneas licenses/README.md at 4d200a0; Gentle README at 087a3b7; Gentle COPYING at 087a3b7; Gentle install_models.sh at 087a3b7"
    },
    {
      "url": "https://github.com/lowerquality/gentle/blob/087a3b738bad9ebafd0570561486252cb624ba3a/COPYING",
      "note": "aeneas README at 4d200a0 L5, L9, L236-239, L257, L261-270, L291-300; aeneas LICENSE; aeneas licenses/README.md at 4d200a0; Gentle README at 087a3b7; Gentle COPYING at 087a3b7; Gentle install_models.sh at 087a3b7"
    },
    {
      "url": "https://github.com/lowerquality/gentle/blob/087a3b738bad9ebafd0570561486252cb624ba3a/install_models.sh",
      "note": "aeneas README at 4d200a0 L5, L9, L236-239, L257, L261-270, L291-300; aeneas LICENSE; aeneas licenses/README.md at 4d200a0; Gentle README at 087a3b7; Gentle COPYING at 087a3b7; Gentle install_models.sh at 087a3b7"
    }
  ]
}
```

Evidence claims:
- [sourced_fact] aeneas is AGPL-3.0 code (README 1.7.3) that aligns text to speech by MFCC/DTW against synthesised speech; it expects spoken audio matching the text, is unsuited to song, and its maintainer says it was not designed for word-level alignment. Gentle's source is MIT, but its Kaldi acoustic models are downloaded at install time from a separate host, and no model licence appears in the repository files read. Neither README gives an accuracy figure. · locator: aeneas README at 4d200a0 L5, L9, L236-239, L257, L261-270, L291-300; aeneas LICENSE; aeneas licenses/README.md at 4d200a0; Gentle README at 087a3b7; Gentle COPYING at 087a3b7; Gentle install_models.sh at 087a3b7 · source: https://github.com/readbeyond/aeneas/blob/4d200a050690903b30b3d885b44714fecb23f18a/README.md

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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