Redaction feels safe. It isn't. Dropping a black box over a name in a PDF and assuming the name is gone is a very human reflex, yet the text underneath almost always survives, intact, sitting right under the bar. One click selects it. A copy-paste reveals it. A simple PDF extraction pulls it back, word for word. And before you send that document to an AI, this fake redaction turns into a very real trap.
Why visual redaction fails
A PDF hides a secret. Beneath the image you actually see, a PDF or Word document keeps a text layer that is completely separate from the display, and drawing a box on top never touches it. The content is still there. Present. Extractable. Worse: when you paste the text into an AI, that hidden layer is exactly what leaves, box or not. And blurring a screenshot? Same flaw, the moment the resolution lets you read it.
What real masking is
Real masking means replacing the content itself, not covering it up. Big difference. The name is no longer in the file: it has been swapped for a token (PERSONNE_1), or simply removed. Nothing to extract. Nothing to read behind it.
The case of scans and images
Scans are a different beast. The text is trapped inside the image: you have to read it with OCR first, then rewrite a masked version, or the information stays on display, pixel by pixel, for anyone to see. A box laid on top? Still not enough.
Safe-Doc does the deep work: it genuinely replaces identifying data in the text layer, runs scans through OCR, and preserves the original layout. The full story is on the Safe-Doc for law firms page.
Do not trust the black box. Mask for real, before you send anything to an AI.