Click Encrypt, select a password, and then retype it to verify.In the Preview, open the PDF file you want to encrypt. You can password-protect your PDF using Preview, a built-in image and PDF viewer on macOS: In this guide, we’ll show you 3 ways how to encrypt a PDF on Mac. Sometimes you need to protect your PDF documents from all the digital T-Rexes that are roaming around. Years later, only movie fans remember Jurassic Park, whereas we use PDF more than ever. The same year, something else happened: Adobe presented PDF. It was an instant hit and the best-grossing movie in history at that time. In 1993 Steven Spielberg directed Jurassic Park.
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