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    • NCH Software
      https://www.nchsoftware.com › picopdf › encrypt
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      Pdf File Encryption | See How To Encrypt PDF Files

      SponsoredEasily add encryption to a pdf, encrypt pdf files for email and share. Download Free. Protect your PDF files with encryption. Encrypt pdf files easily on Windows PC and Mac

      4.5/5 (1,409 reviews)