# What does the W3C imsc-tests repository contain (TTML source files and reference PNG renderings) and under what licence text can its files be used?

- id: art_01M5MDJE5BY0VJBY9KGBRHRT4F
- 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, T20 · tags: none
- updated: 2026-10-23T13:00:28.682Z
- url: https://veyrul.com/articles/art_01M5MDJE5BY0VJBY9KGBRHRT4F

w3c/imsc-tests (14dfb678) licenses its documents under both the W3C Test Suite License (which grants no right to modify and says tests may not be altered) and the W3C 3-clause BSD licence, at the licensee's choice, unless a document carries another compatible licence; the imsc1 README attributes 58 TTML files to IRT tests under an Apache-2.0 licence and 196 to the W3C TTML and IMSC implementation reports.

w3c/imsc-tests (14dfb678) licenses its documents under both the W3C Test Suite License (which grants no right to modify and says tests may not be altered) and the W3C 3-clause BSD licence, at the licensee's choice, unless a document carries another compatible licence; the imsc1 README attributes 58 TTML files to IRT tests under an Apache-2.0 licence and 196 to the W3C TTML and IMSC implementation reports.

Curator qualifications: Correction to producer E4/F1: the 254 listed files are not all IRT-derived; 58 are IRT-derived and 196 W3C-derived (curator count by README section). Tree counts (321 .ttml, 1,542 PNG; E1) not re-queried; exemplar PNGs are imscJS renderings (producer). Text only; no tests run or files downloaded beyond licence/README.

Limitations: Text only; no tests run or files downloaded beyond licence/README.

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/w3c/imsc-tests/blob/14dfb6787275b5f568cae66fcae581652fb390b8/LICENSE.md",
      "note": "imsc-tests LICENSE.md lines 1-19 at 14dfb678; imsc1/README.md sections: line 27 \"## Institut fur Rundfunktechnik (IRT)\", line 92 \"## W3C\"; IRT-Open-Source/irt-ebu-tt-d-application-samples LICENSE at 75933dd2"
    },
    {
      "url": "https://github.com/w3c/imsc-tests/blob/14dfb6787275b5f568cae66fcae581652fb390b8/imsc1/README.md",
      "note": "imsc-tests LICENSE.md lines 1-19 at 14dfb678; imsc1/README.md sections: line 27 \"## Institut fur Rundfunktechnik (IRT)\", line 92 \"## W3C\"; IRT-Open-Source/irt-ebu-tt-d-application-samples LICENSE at 75933dd2"
    },
    {
      "url": "https://github.com/w3c/imsc-tests/blob/14dfb6787275b5f568cae66fcae581652fb390b8/README.md",
      "note": "imsc-tests LICENSE.md lines 1-19 at 14dfb678; imsc1/README.md sections: line 27 \"## Institut fur Rundfunktechnik (IRT)\", line 92 \"## W3C\"; IRT-Open-Source/irt-ebu-tt-d-application-samples LICENSE at 75933dd2"
    },
    {
      "url": "https://github.com/IRT-Open-Source/irt-ebu-tt-d-application-samples/blob/75933dd2c7f378cf6ce06118a74838c20ea905d5/LICENSE",
      "note": "imsc-tests LICENSE.md lines 1-19 at 14dfb678; imsc1/README.md sections: line 27 \"## Institut fur Rundfunktechnik (IRT)\", line 92 \"## W3C\"; IRT-Open-Source/irt-ebu-tt-d-application-samples LICENSE at 75933dd2"
    },
    {
      "url": "https://github.com/w3c/imsc-tests/tree/14dfb6787275b5f568cae66fcae581652fb390b8",
      "note": "imsc-tests LICENSE.md lines 1-19 at 14dfb678; imsc1/README.md sections: line 27 \"## Institut fur Rundfunktechnik (IRT)\", line 92 \"## W3C\"; IRT-Open-Source/irt-ebu-tt-d-application-samples LICENSE at 75933dd2"
    }
  ]
}
```

Evidence claims:
- [sourced_fact] w3c/imsc-tests (14dfb678) licenses its documents under both the W3C Test Suite License (which grants no right to modify and says tests may not be altered) and the W3C 3-clause BSD licence, at the licensee's choice, unless a document carries another compatible licence; the imsc1 README attributes 58 TTML files to IRT tests under an Apache-2.0 licence and 196 to the W3C TTML and IMSC implementation reports. · locator: imsc-tests LICENSE.md lines 1-19 at 14dfb678; imsc1/README.md sections: line 27 "## Institut fur Rundfunktechnik (IRT)", line 92 "## W3C"; IRT-Open-Source/irt-ebu-tt-d-application-samples LICENSE at 75933dd2 · source: https://github.com/w3c/imsc-tests/blob/14dfb6787275b5f568cae66fcae581652fb390b8/LICENSE.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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