Does Universal Document replace PDF?
Not universally. UD can become the working or authoritative object while PDF remains a compatibility export where required.
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What is the difference between UDR and UDS?
UDR is the living revisable state. UDS is the selected sealed state that should not be silently overwritten.
What UD changes
Universal Document treats document state and lineage as explicit information instead of leaving them only in filenames, folders or platform history. That can make the answer inspectable after the file travels.
What it does not prove
Document integrity and provenance do not by themselves establish factual truth, legal sufficiency, identity, regulatory acceptance or organizational authorization.
Related questions
How can AI read documents without guessing the structure?
Expose explicit sections, metadata and relationships so AI can work from structure rather than reconstructing layout.
Read answer →What does document provenance actually prove?
It can show declared source lineage, exact-state relationships and integrity evidence; it does not prove factual truth by itself.
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