PDF Metadata: What It Reveals and How to Read It
Every PDF carries two hidden records about where it came from. Here's how to read the Info dictionary and the XMP packet, what each field means, and the disagreement that exposes tampering.
How to Tell if a PDF Has Been Edited: 6 Checks That Actually Work
Six practical checks — from metadata dates to hidden revision history — that reveal whether a PDF was modified after it was created, and what each one can and can't prove.
How to Tell if a Contract Was Altered After Signing
Two copies of "the same" agreement, one clause different. How to prove which version is real — from signature validation to word-level diffs and the PDF's own history.
How to Redact a PDF Properly (Without Leaking the Data)
Drawing a black box over text does not remove the text. The difference between redaction and the appearance of redaction — and a workflow to make sure you're doing the first one.