Protected PDF: Why You Can't Copy or Print It, and How to Unlock It
We tested five protected PDFs: open passwords vs print and copy restrictions, how to unlock each one properly, and when you're entitled to.
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Guides for securing, encrypting, protecting, and signing PDF documents.
How to Redact a PDF: Why a Black Box Isn't Enough (We Tested It)
We hid numbers in a PDF with black boxes and recovered every one. Six places information leaks from, how to redact a PDF properly, and how to check a file before you send it.
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