The column four vendors fill and eleven leave empty

Eleven of the fifteen generators here record machine-readable marking as not documented. Four fill it: Sora, Veo and Amazon Nova Reel in a developer or safety document, and SceneMixer in its terms of service. As of 2026-10-25.

Inclusion rule. Generators on this site read against one question: does any public page name a field, a format or a standard written into the output. Order. Alphabetical by vendor name.

1Not documented is not the same as not present

An encoder writes metadata whether or not a marketing page mentions it. The claim this column makes is narrow and checkable: no public page of this vendor names a field, a format or a standard. Anything beyond that would require opening files, which is a different activity with different failure modes.

The distinction matters when somebody quotes this site. Eleven empty cells are evidence that the question is not being answered publicly, and they are not evidence that the answer is no. The four filled cells are what a published answer looks like, and they set the bar the other eleven are being measured against: a named standard, or a signal whose behaviour the vendor describes.

2What the filled cells actually say

The three are not variations on one announcement. Sora's system card lists C2PA metadata on all assets alongside a visible moving watermark and internal detection tools, as a set of provenance measures with no plan attached to any of them. Veo's API documentation says, under Limitations, that videos are watermarked with SynthID and can be verified using the SynthID verification platform. Amazon Nova Reel's service card states an invisible watermark on all generated videos and, on version 1.1, Content Credentials built on the C2PA specification carrying the model and platform that made the file.

Two things follow. The first is that a filled cell here comes with a reader: two of the three name somewhere a file can be checked, which is the difference between a signal and a claim about a signal. The second is that none of the three sells the mark. All three describe it as a property of the output, in documents written for developers or reviewers, which is why none of them has anything to say about tiers.

The fourth cell comes from a contract. SceneMixer's terms state an invisible, compression-resistant watermark or content credential under named rules, and say it is never removed, though no reader for it is published.

3The cell that was filled from a contract

SceneMixer's guide had long told publishers to preserve whatever content credentials the tool writes, and warned that an editor that strips metadata removes that layer, without saying what the layer was. Its terms now state it outright: an invisible, compression-resistant watermark or content credential, applied under named rules and never removed.

What it still does not publish is a way to read it. A signal a downstream party cannot check is a commitment rather than a test, so the cell is filled to the standard of a contract rather than of a verification platform.

4Why the site kept a column that was empty for months

Dropping it would have made the table tidier and would have hidden the finding. The most consistent fact across this record is still that the visible mark is discussed everywhere and the invisible one in a handful of places, and a table without the column cannot show that. It also could not have shown the column filling up, which is the more useful thing it does now.

The column fills in the ordinary way, and it has started to: four cells now carry a standard name and a reading date, where a year ago the whole column would have been silent. The remaining eleven say not documented, and the reader knows exactly how much that claim covers, which is the published pages of that vendor on the day they were read.

• 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
  An invisible, compression-resistant watermark or content credential is applied to output and never removedstated in the termsSceneMixer, terms of service / recorded 2026-10-13
• 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 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 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 pageRunway, pricing / recorded 2026-09-12
• Machine-readable marking
  Not documented on the vendor's public pages (as of 2026-10-25)not listed among the parameters or the responseModel Studio, text-to-video API reference / since 2026-09-22 / checked 2026-10-25
• Machine-readable marking
  Not documented on the vendor's public pages (as of 2026-09-22)not mentioned on the pricing pageHeyGen, pricing / recorded 2026-09-22
• Machine-readable marking
  Not documented on the vendor's public pages (as of 2026-09-22)not mentioned on the pricing pageSynthesia, pricing / recorded 2026-09-22
• Machine-readable marking
  Not documented on the vendor's public pages (as of 2026-09-22)not mentioned on the pricing pageFliki, pricing / recorded 2026-09-22
• Machine-readable marking
  Not documented on the vendor's public pages (as of 2026-09-22)not mentioned on the pricing pageD-ID, pricing / recorded 2026-09-22
• Machine-readable marking
  Not documented on the vendor's public pages (as of 2026-09-22)not raised on the licensing pageLuma, Dream Machine licensing guide / recorded 2026-09-22
• Machine-readable marking
  Not documented on the vendor's public pages (as of 2026-09-22)not mentioned on the pricing pagePictory, pricing / recorded 2026-09-22

5Sources

Every line is read from the vendor pages listed on the support table, checked 2026-10-25. What earns a row is set out in the protocol. Nearby: Surviving an export, Checking a file, At which step.