# How did ISDCF Doc 7 (digital cinema language codes) change across its Internet Archive captures, and what did the 2020-12-08 revision change?

- id: art_01M5MSGNRJESX6CV6JW2D92XYH
- 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: 2026-10-23T16:29:13.867Z
- url: https://veyrul.com/articles/art_01M5MSGNRJESX6CV6JW2D92XYH

ISDCF Doc 7 changed in three steps. Version A (2017) was a 3-page code table. Version B (captured 2018-2021) added languages, region subtags and a revision history. Version C (footer 2021-12-08) drops the table, adds a case-sensitivity section and defers to the ISDCF language register, citing a 2020-12-08 revision. On 2026-10-22 the original PDF URL returns 404, so the register is the only live source.

ISDCF Doc 7 changed in three steps. Version A (2017) was a 3-page code table. Version B (captured 2018-2021) added languages, region subtags and a revision history. Version C (footer 2021-12-08) drops the table, adds a case-sensitivity section and defers to the ISDCF language register, citing a 2020-12-08 revision. On 2026-10-22 the original PDF URL returns 404, so the register is the only live source.

Curator qualifications: Pages, PDFs and code read 2026-10-22; no DCP named or validated; ClairMeta not run. Version A text and the CDX digest/timing analysis (no 2020-12..2021-12 capture with the defer text) carried from producer reading.

Limitations: Pages, PDFs and code read 2026-10-22; no DCP named or validated; ClairMeta not run.

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

```json
{
  "citations": [
    {
      "url": "https://web.archive.org/web/20170930013240id_/http://isdcf.com/papers/ISDCF-Doc7-DigitalCinemaLanguageCodes.pdf",
      "note": "Wayback 20181008235230 Doc 7 PDF (version B); Wayback 20221211174845 Doc 7 PDF (version C, footer 20211208); https://isdcf.com/papers/ISDCF-Doc7-DigitalCinemaLanguageCodes.pdf (live, 2026-10-22)"
    },
    {
      "url": "https://web.archive.org/web/20181008235230id_/http://isdcf.com/papers/ISDCF-Doc7-DigitalCinemaLanguageCodes.pdf",
      "note": "Wayback 20181008235230 Doc 7 PDF (version B); Wayback 20221211174845 Doc 7 PDF (version C, footer 20211208); https://isdcf.com/papers/ISDCF-Doc7-DigitalCinemaLanguageCodes.pdf (live, 2026-10-22)"
    },
    {
      "url": "https://web.archive.org/web/20221211174845id_/https://isdcf.com/papers/ISDCF-Doc7-DigitalCinemaLanguageCodes.pdf",
      "note": "Wayback 20181008235230 Doc 7 PDF (version B); Wayback 20221211174845 Doc 7 PDF (version C, footer 20211208); https://isdcf.com/papers/ISDCF-Doc7-DigitalCinemaLanguageCodes.pdf (live, 2026-10-22)"
    },
    {
      "url": "http://web.archive.org/cdx/search/cdx?url=isdcf.com/papers/ISDCF-Doc7*&output=txt&fl=timestamp,original,statuscode,mimetype,digest,length",
      "note": "Wayback 20181008235230 Doc 7 PDF (version B); Wayback 20221211174845 Doc 7 PDF (version C, footer 20211208); https://isdcf.com/papers/ISDCF-Doc7-DigitalCinemaLanguageCodes.pdf (live, 2026-10-22)"
    }
  ]
}
```

Evidence claims:
- [sourced_fact] ISDCF Doc 7 changed in three steps. Version A (2017) was a 3-page code table. Version B (captured 2018-2021) added languages, region subtags and a revision history. Version C (footer 2021-12-08) drops the table, adds a case-sensitivity section and defers to the ISDCF language register, citing a 2020-12-08 revision. On 2026-10-22 the original PDF URL returns 404, so the register is the only live source. · locator: Wayback 20181008235230 Doc 7 PDF (version B); Wayback 20221211174845 Doc 7 PDF (version C, footer 20211208); https://isdcf.com/papers/ISDCF-Doc7-DigitalCinemaLanguageCodes.pdf (live, 2026-10-22) · source: https://web.archive.org/web/20170930013240id_/http://isdcf.com/papers/ISDCF-Doc7-DigitalCinemaLanguageCodes.pdf

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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