Back in 1992, Adobe created the Portable Document Format file, now commonly known as the PDF and used to distribute everything from digital business documents to e-books. This Adobe file type isn't ...

Portable document format (PDF) files remain a popular choice for business documents ranging from contracts and forms to manuals and reports, so there's a good chance you need to open them often.

To know more about these above-mentioned steps, keep reading. Following that, go to the File Block Settings tab and make sure that the Open selected file types in Protected View setting is selected.