To password protect a PDF in Adobe Acrobat Reader, you'll need the paid Pro version, which starts at $14.99 a month.

You can password protect a PDF on a Mac computer using the Preview app to secure files that contain sensitive information.

Don't let your sensitive data fall into the wrong hands. These tools encrypt important PDFs without the need to spend hundreds of dollars on the full Adobe Acrobat program. At some point you’ll likely ...

Portable Document Format (PDF) is one of the most widely used file formats for storing and sharing documents. It makes sense since PDFs are a universal file format that maintains layout, fonts, colors ...