Comment by lxgr

> I'm wondering why they have restricted file types. You can't check a PDF for example...

TFA/page actually seems incomplete. Text uses a completely different watermark format (an actual watermark as opposed to a provenance/authenticity signature), so it makes sense to me that they're not claiming to be able to scan PDFs when they can't yet incorporate that signal.

On a linked page, they say:

> Watermark detection is currently in private preview [...]