What is HDR10+ dynamic metadata, what does it contain, and what happens on a display or tool that does not support it?

HDR10+ is HDR10 (PQ, BT.2020, static ST 2086 + optional MaxCLL/MaxFALL) plus per-scene or per-frame metadata standardised as SMPTE ST 2094-40 (Application #4). The metadata carries scene statistics (MaxSCL per colour component, average maxRGB, a percentile distribution of maxRGB) and optionally a Bezier tone curve with a knee point and a targeted display luminance. It travels as an ITU-T T.35 SEI message in the video stream, so a non-supporting display ignores it and falls back to HDR10. The public statements about licensing differ in tone: HDR10+ Technologies says no licensing fees; the SMPTE standard's foreword records claimed IPR licensable on reasonable terms. Curator correction 2026-10-24 (discovery audit record C3-B1058-02, curator-reviewed C3R-0688; excerpts re-located by independent curator GET 2026-10-24): Correction. C3-B043-G15-04 reports that HDR10+ Technologies "says no licensing fees" (whitepaper, file dated 2024-01-25) and sets this against the SMPTE IPR notice. It omits the programme terms on the same body's home page, which call the licence royalty-free but list an "Annual Administration" fee per adopter category (source provider $2,500, display manufacturer $10,000, SoC vendor $4,000; content company and tool vendor N/A) and cap aggregate annual administration fees at US$10,000. Web archive captures from 2024-04-23 to 2024-09-01 (for example 20240625175105) show the same fee wording, and the live page showed it on 2026-10-24, so the omission existed when the record was written (2026-10-22); the same live page also says "any manufacturer can adopt it without a licensing fee", so HDR10+ Technologies' own pages are not consistent on fees. The whitepaper quote itself is accurate. No legal conclusion. Curator qualifications: All pins match the producer's hashes. ST 2094-40:2020: 'Application version 1 is introduced in the 2020 revision'; version-dependent items are DistributionMaxRGB, BezierCurveAnchors and FractionBrightPixels; 8.7.3.1 version 0 'BezierCurveAnchors length shall be in the range [0,15]', 8.7.3.2 version 1 '[0,9]'. Whitepaper: 'If a display doesn’t support the HDR10+ metadata, it will be simply ignored as any other optional ITU-T T.35 metadata and the display reverts to show the strict version of HDR10'; carriage stated for 'HEVC and VP9 compatibility via WebM as well as any codec that supports ITU-T T.35 metadata'. S5: 'requires no licensing fees'. metadata.rs validate() ensures application_identifier == 4 and application_version == 1, so version-0 metadata fails validation when validation runs (code-derived inference, not executed); it also requires targeted_system_display_maximum_luminance == 0 when tone_mapping_flag is false (profile A) and non-zero for profile B. c3excerpts: 8/8 non-empty excerpts present. 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 from C3R-0085: 'no licensing fees'/'royalty-free' (HDR10+ Technologies) vs SMPTE foreword's claimed IPR licensable on reasonable and non-discriminatory terms; no legal conclusion. Adopter/logo programme terms not read. Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

{
  "citations": [
    {
      "url": "https://hdr10plus.org/wp-content/uploads/2023/11/HDR10_WhitePaper.pdf",
      "note": "HDR10+ System Whitepaper (September 4, 2019), pp.8-9 Backward Compatibility, Applicable Content Profile; Understanding the HDR10 Ecosystem, '3. Ease of implementation'; SMPTE ST 2094-40:2020 Introduction p.3, Scope p.4, 8.7.3.1-8.7.3.2 p.10, Foreword IPR; hdr10plus_tool 82cb01ba hdr10plus/src/metadata.rs validate() (curator lines 188-249; blob e03044c3 via git/trees GET)"
    },
    {
      "url": "https://pub.smpte.org/pub/st2094-40/st2094-40-2020.pdf",
      "note": "HDR10+ System Whitepaper (September 4, 2019), pp.8-9 Backward Compatibility, Applicable Content Profile; Understanding the HDR10 Ecosystem, '3. Ease of implementation'; SMPTE ST 2094-40:2020 Introduction p.3, Scope p.4, 8.7.3.1-8.7.3.2 p.10, Foreword IPR; hdr10plus_tool 82cb01ba hdr10plus/src/metadata.rs validate() (curator lines 188-249; blob e03044c3 via git/trees GET)"
    },
    {
      "url": "https://hdr10plus.org/wp-content/uploads/2024/01/HDR10_Ecosystem_Whitepaper.pdf",
      "note": "HDR10+ System Whitepaper (September 4, 2019), pp.8-9 Backward Compatibility, Applicable Content Profile; Understanding the HDR10 Ecosystem, '3. Ease of implementation'; SMPTE ST 2094-40:2020 Introduction p.3, Scope p.4, 8.7.3.1-8.7.3.2 p.10, Foreword IPR; hdr10plus_tool 82cb01ba hdr10plus/src/metadata.rs validate() (curator lines 188-249; blob e03044c3 via git/trees GET)"
    },
    {
      "url": "https://github.com/quietvoid/hdr10plus_tool/tree/82cb01ba387184476dbf5fa3bddebf0a345693d7",
      "note": "HDR10+ System Whitepaper (September 4, 2019), pp.8-9 Backward Compatibility, Applicable Content Profile; Understanding the HDR10 Ecosystem, '3. Ease of implementation'; SMPTE ST 2094-40:2020 Introduction p.3, Scope p.4, 8.7.3.1-8.7.3.2 p.10, Foreword IPR; hdr10plus_tool 82cb01ba hdr10plus/src/metadata.rs validate() (curator lines 188-249; blob e03044c3 via git/trees GET)"
    }
  ]
}