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PDF metadata, explained

Every PDF carries two layers of metadata, and neither is sealed.

The Info dictionary

The older layer holds the basics: title, author, creation date, modification date, and the names of the software that created and produced the file. Most tools write it. Any tool can rewrite it.

XMP: the edit history

The newer layer, XMP, can carry a revision history: which software touched the file and when. Adobe products write detailed histories. Many other tools write none. A long history tells you about the file's life; an empty one tells you almost nothing.

How metadata misleads

Metadata is written by software, set by clocks, and editable by anyone with the right tool. Treat every field as a claim, not a fact. The useful move is to look for contradictions: dates out of order, a producer that does not match the claimed workflow, a history that stops abruptly.

Check a file now

DocVerdict extracts both layers, reconstructs the timeline, and flags the contradictions worth your attention.