GateTrue

What each generator documents about marking its output

Machine-readable marking: three statements and twelve silences

Machine-readable marking records what a vendor says is written into the file itself. Three generators fill it, naming C2PA or SynthID or an invisible watermark. Twelve record not documented, which is a statement about their pages rather than their files. As of 2026-09-12.

The three kinds of statement that would fill this columnA named provenance scheme, a named metadata key, or a described signal in the picture. Each hands a reader something they can act on afterwards: a specification to look up, a file to open, or a published check to run. A general mention of metadata hands over none of those and does not fill a cell.A named standardA provenance scheme the vendoridentifies by name.A name to look upRead the scheme's ownspecification.A named fieldA metadata key the vendor saysit sets on the file.A key to checkOpen a downloaded file andlook for it.A described signalA mark in the picture whosebehaviour the vendor describes.A behaviour to checkRun the check the vendorpublishes.One filled cell in this columnWhat a reader can do with it afterwards
Fig. 1 Nothing a generator on this register publishes reaches this bar, which is why every cell in that column reads not documented.
Field by field, what each vendor statesFilled where the vendor publishes something in that field, hollow where its pages say nothing.Field by field, what each vendor statesWhat the vendor states is in the fileWhat the vendorstates is in the…Amazon Nova ReelAmazon Nova Reel — What the vendor states is in the file: Invisible watermark plus C2PA Content CredentialsD-IDD-ID — What the vendor states is in the file: Not documentedFlikiFliki — What the vendor states is in the file: Not documentedHeyGenHeyGen — What the vendor states is in the file: Not documentedKling AIKling AI — What the vendor states is in the file: Not documentedLTX StudioLTX Studio — What the vendor states is in the file: Not documentedLuma AILuma AI — What the vendor states is in the file: Not documentedPictoryPictory — What the vendor states is in the file: Not documentedPikaPika — What the vendor states is in the file: Not documentedRunwayRunway — What the vendor states is in the file: Not documentedSceneMixerSceneMixer — What the vendor states is in the file: Not documentedSoraSora — What the vendor states is in the file: C2PA on every asset, standard namedSynthesiaSynthesia — What the vendor states is in the file: Not documentedVeoVeo — What the vendor states is in the file: SynthID, with a verification platform namedWanWan — What the vendor states is in the file: Not documented
Fig. 2 Filled where the vendor publishes something in that field, hollow where its pages say nothing.
What each generator publishes about signals written into the output file. Rows read on their own dates, the most recent 2026-09-22.
GeneratorWhat the vendor states is in the file
Amazon Nova ReelInvisible watermark plus C2PA Content Credentials
D-IDNot documented
FlikiNot documented
HeyGenNot documented
Kling AINot documented
LTX StudioNot documented
Luma AINot documented
PictoryNot documented
PikaNot documented
RunwayNot documented
SceneMixerNot documented
SoraC2PA on every asset, standard named
SynthesiaNot documented
VeoSynthID, with a verification platform named
WanNot documented

Inclusion rule. Every generator on this register. A named standard, a named metadata field or a described signal fills this column; a general mention of metadata does not. Order. Alphabetical by generator name.

1What would fill this column

Three kinds of statement count. A provenance scheme named so that a reader can look up what it writes. A metadata key named so that it can be checked in a downloaded file. Or a signal in the picture whose behaviour the vendor describes, as Google does for SynthID. Each of them hands a reader something to do next, and that is the test a sentence has to pass before it fills a cell here.

A gesture at metadata does not count. SceneMixer's guide tells publishers to keep whatever content credentials or generation metadata the tool writes, and warns that re-encoding can strip that layer, which implies something is there. It names no scheme and lists no field, so the cell says not documented and the sentence that raised the question is kept on that generator's own page instead.

Three generators now clear that bar. Sora's system card names C2PA metadata on all assets. Veo's API documentation names SynthID and the platform that verifies it. Amazon Nova Reel's service card names both an invisible watermark applied to everything it generates and, on version 1.1, Content Credentials built on C2PA and carrying the model and platform that produced the file. Each of those hands a reader something to do next, which is exactly the test.

2An empty cell is the finding

Twelve generators on this register record not documented here, and that is not a gap in the reading. It is the answer to a question people ask about a tool before committing a series to it: does it tell you what it puts inside your files. On the pages those rows are read from, none of them does, and the three exceptions make the silence harder to explain away as an industry-wide impossibility.

The cell is not a claim about the product either. A vendor can write provenance data without describing it anywhere, and several probably do. What a register built from published pages can honestly say is that nothing is published, which is why the value is printed as a stated position rather than left as a blank a reader would take for an oversight.

3What a filled version looks like, and where the fullest one lives

SynthID is the entry shaped most completely like a filled cell, and it sits under implementers rather than in the generator table because it inverts the other three columns: nothing is visible, no tier lifts it, and nothing is offered as removable. Google states where it is embedded, that it is written the moment content is created, which transformations it is designed to survive, and two routes for checking a file. Veo's documentation is the generator-side counterpart to that scheme, which is why the two are kept as separate rows.

Reading those statements beside a dozen empty cells is the clearest argument for keeping this column apart from the visible-mark ones. Detection and marking are different capabilities, and a file can carry a signal that nobody outside the vendor is able to read, which is precisely what Sora's internal detection tools are described as. The filled cells that help a receiving party are the ones that name a public reader.

  • Machine-readable marking
    In the same list: C2PA metadata on all assets, providing verifiable origin through an industry standardstandard namedOpenAI, Sora 2 system card / recorded 2026-09-22
  • Machine-readable marking
    Videos created by Veo are watermarked using SynthID, described as the vendor's tool for watermarking and identifying AI-generated contentstated under LimitationsGemini API, Veo documentation / recorded 2026-09-22
  • Machine-readable marking
    Amazon Nova Reel applies an invisible watermark to all videos it generates, and the detection solution can check for the existence of that watermarkapplied to all outputAWS, Amazon Nova Reel service card / recorded 2026-09-22
  • Machine-readable marking
    Amazon Nova Reel 1.1 adds Content Credentials to videos it generates, built on the C2PA specification, carrying the model and the platform used to generate the videostandard namedAWS, Amazon Nova Reel service card / recorded 2026-09-22
  • Machine-readable marking
    Not documented on the vendor's public pages (as of 2026-09-12)not mentioned in the plan tableKling AI, membership plans / recorded 2026-09-12
  • Machine-readable marking
    Not documented on the vendor's public pages (as of 2026-09-12)not mentioned on the pricing pageLTX Studio, pricing / recorded 2026-09-12
  • Machine-readable marking
    Not documented on the vendor's public pages (as of 2026-09-12)not mentioned on the pricing pagePika, pricing / recorded 2026-09-12
  • Machine-readable marking
    Not documented on the vendor's public pages (as of 2026-09-12)not mentioned on the pricing pageRunway, pricing / recorded 2026-09-12
  • Machine-readable marking
    Not documented on the vendor's public pages (as of 2026-09-12)no field list publishedSceneMixer, compliance guide / recorded 2026-09-12
  • Machine-readable marking
    An invisible watermark is embedded across Google's generative AI consumer productsproduct-wideGoogle DeepMind, SynthID / recorded 2026-09-12
  • When it is written
    The watermark is added the moment content is created and does not change image or video qualityat generationGoogle DeepMind, SynthID / recorded 2026-09-12
  • Robustness
    Designed to stand up to cropping, added filters, changed frame rates and lossy compressionas stated by the vendorGoogle DeepMind, SynthID / recorded 2026-09-12
  • Detection
    Gemini checks an uploaded image, video or audio clip for the watermark, and a separate SynthID Detector portal is in testing with journaliststwo published routesGoogle DeepMind, SynthID / recorded 2026-09-12

4Sources

Every value above is read from the vendor page named beside its row on the support table, checked 2026-09-22. What this column is allowed to hold is defined on the protocol page, and the rest of the columns are on the fields index. Next columns along: free tier, paid tier.