![]() ![]() There are various security-related features supported by the PDF file format such as password-protection, digital signatures, certificates, etc.Īnother one is that it uses only one file extension, unlike other document file types. One of the most important ones is its ability to create password-protected documents. There are a number of reasons behind the dominance of the PDF file format. PDF (.pdf) is an acronym for Portable Document Format. Best PDF Readers and Viewers Software for Windows for Viewing/Reading, Basic Editing, and Annotating PDF Documents
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