Update entry 49 (com.museblossom.contentsdefence.1) — add audio and v…

[seulgi97]

…ideo

Update entry 49 (com.museblossom.contentsdefence.1) — add audio and video

What changes

Only decodedMediaTypes changes, from ["image"] to ["audio", "image", "video"].

Per the contribution guidelines, identifier, alg and type are unchanged.

   "identifier": 49,
   "alg": "com.museblossom.contentsdefence.1",
   "type": "watermark",
-  "decodedMediaTypes": ["image"],
+  "decodedMediaTypes": ["audio", "image", "video"],

Why

Contents Defence (MuseBlossom Co., Ltd.) now embeds and extracts the same invisible watermark in audio and video assets, not only still images. The algorithm and its identifier are unchanged — the entry's media-type scope simply no longer reflects what the algorithm covers.

The watermark serves the same purpose in all three media families: recovering the associated C2PA manifest from a Manifest Repository when embedded metadata has been stripped (for example after re-encoding on social platforms).

Checklist against the selection rules

• Conforms to the schema — decodedMediaTypes values are from the documented enum (application, audio, image, model, text, video).
• identifier, alg, type unchanged, as required for updates.
• Submitted by an individual affiliated with MuseBlossom Co., Ltd., which owns the algorithm.
• informationalUrl (https://museblossom.com/about) resolves.
• The algorithm supports both embedding and extraction of the soft binding identifier for manifest recovery.

[domguinard]

Thanks for the update. This will be checked an approved during the WM TF meeting on Sept 30.

Note for the team: these updates make me think we need a dateUpdated field as well. To be discussed.

[domguinard]

Approved during the WM TF meeting on Sept 30 2026.