What each generator documents about marking its output
How Sora marks its output
Sora (openai.com) is documented in a system card rather than on a price list, and it is the first entry here to fill the machine-readable field: C2PA metadata on all assets, plus a visible moving watermark on downloads. From 1 source page, read 2026-09-22; no maker pays to be listed.
Fig. 1 The strongest detection route here is the one an outside party cannot use; the metadata is the one anybody with a reader can.Fig. 2 Filled where the vendor publishes something in that field, hollow where its pages say nothing.
The four fields this site records, for Sora. Read from the vendor's Sora 2 system card on 2026-09-22.
Inclusion rule. Fields are the same four for every generator on this site; a field the vendor does not publish is recorded as not documented rather than inferred from how the product behaves. Order. Fixed field order, identical on every generator page.
1Three provenance layers, listed together and priced at none of them
The system card's provenance section lists what the vendor's provenance tooling for its own products will include at general availability: C2PA metadata on all assets, a visible moving watermark on videos downloaded from sora.com or the Sora app, and internal detection tools that help assess whether a video or audio clip came from those products. Three layers, described as a set, with no plan, tier or setting attached to any of them anywhere in the document. The tense is the vendor's and is kept: this is a list of what the tooling is stated to include, read on the day the row was written.
That is the opposite shape to the plan-gated rows in this register, where the mark exists to be removed by a purchase. Here the mark is described as part of how the product works, and the paid field is recorded as not documented because the page that was read attaches no plan condition to it. That is a statement about this document, not a claim that no plan difference exists.
2A moving watermark and an internal detector are unusual in different ways
Moving is the load-bearing word in the visible layer. A static corner mark can be cropped away with the corner; a mark that travels has to be tracked across the frame to be removed cleanly. No size, path or duration is published, so the register records the wording and stops there, but the adjective is worth keeping because it is the only description of a mark's behaviour anywhere in this record.
The detection layer runs the other way. C2PA metadata is a standard anyone with a reader can check, while the internal tools are described as the vendor's own, which means the strongest detection route in this entry is the one an outside party cannot use. Both facts are recorded separately for that reason: what a file carries and who can read it are different questions.
Fig. 3 Free tier, every generator, Sora marked. Hollow means the vendor's pages say nothing there; the exact wording is in the rows below. Recorded 2026-09-22.
Free tier, every generator, with Sora marked. Recorded 2026-09-22.
Inclusion rule. Generators whose public pages state whether output carries a mark. A generator silent on this particular field keeps its row, marked hollow. Order. Alphabetical by generator name.
Fig. 4 Paid tier, every generator, Sora marked, read the same way as the free-tier figure above.
Paid tier, every generator, with Sora marked. Recorded 2026-09-22.
Inclusion rule. Generators whose public pages state whether output carries a mark. A generator silent on this particular field keeps its row, marked hollow. Order. Alphabetical by generator name.
Fig. 5 User toggle, every generator, Sora marked, read the same way as the free-tier figure above.
User toggle, every generator, with Sora marked. Recorded 2026-09-22.
Inclusion rule. Generators whose public pages state whether output carries a mark. A generator silent on this particular field keeps its row, marked hollow. Order. Alphabetical by generator name.
Fig. 6 Machine-readable marking, every generator, Sora marked, read the same way as the free-tier figure above.
Machine-readable marking, every generator, with Sora marked. Recorded 2026-09-22.
Inclusion rule. Generators whose public pages state whether output carries a mark. A generator silent on this particular field keeps its row, marked hollow. Order. Alphabetical by generator name.
Every line above is read from the Sora 2 system card published at openai.com, checked 2026-09-22. The same four fields for every generator are on the support table, and the column definitions are on the fields pages. Next along the register: SceneMixer, Synthesia.
Visible mark
Listed for general availability among the provenance tooling for the vendor's own products: a visible moving watermark on videos downloaded from sora.com or the Sora applisted as provenance toolingOpenAI, Sora 2 system card/ recorded 2026-09-22
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
Detection
Also in that list: internal detection tools to help assess whether a certain video or audio was created by the vendor's productsheld inside the vendorOpenAI, Sora 2 system card/ recorded 2026-09-22
Paid tier
Not documented on the vendor's public pages (as of 2026-09-22)the system card attaches no plan to the watermarkOpenAI, Sora 2 system card/ recorded 2026-09-22