What is the best way to protect your markups from being changed by others?

• A. Encrypt PDF
• B. Lock markup
• C. Hide markups
• D. Flatten markup

Answer: (D)

Flattening is the most reliable way to protect markups from being changed because it bakes the annotations into the page content, turning them into part of the PDF image rather than editable objects. Once flattened, markups can’t be moved, resized, or modified with the markup tools, so others viewing the document won’t be able to alter them without rebuilding the markup from scratch. Locking or hiding markups can still be undone or bypassed by someone with the right permissions, and encryption controls access but doesn’t inherently prevent edits to the content once a file is opened. By flattening, you preserve the appearance you intended and prevent post‑facto edits.