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 in Adobe Reader by ...

PDF (Portable Document Format) is the most widely accepted file format for sharing documents, including images, text, and other information. Not just that, it can also contain rich media elements such ...

Select whether you want to restrict editing with a password or encrypt the file with a certificate or password. Check the Check copy text, images, and other content box is clear. In Compatibility, ...

Adobe made a critical change to the algorithm used to password-protect PDF documents in Acrobat 9, making it much easier to recover a password and raising concern over the safety of documents, ...