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2. PDF - Wikipedia

   en.wikipedia.org/wiki/PDF

   PDF 2.0 defines 256-bit AES encryption as the standard for PDF 2.0 files. The PDF Reference also defines ways that third parties can define their own encryption systems for PDF. PDF files may be digitally signed, to provide secure authentication; complete details on implementing digital signatures in PDF are provided in ISO 32000-2.

3. List of PDF software - Wikipedia

   en.wikipedia.org/wiki/List_of_PDF_software

   As with Adobe Acrobat, Nitro PDF Pro's reader is free; but unlike Adobe's free reader, Nitro's free reader allows PDF creation (via a virtual printer driver, or by specifying a filename in the reader's interface, or by drag-'n-drop of a file to Nitro PDF Reader's Windows desktop icon); Ghostscript not needed.

4. QPDF - Wikipedia

   en.wikipedia.org/wiki/QPDF

   QPDF is a software library and a free command-line program that can convert one PDF file to another equivalent PDF file. It is capable of performing transformations such as linearization (also known as web optimization or fast web viewing), encryption, and decryption of PDF files. [2]

5. PDF/A - Wikipedia

   en.wikipedia.org/wiki/PDF/A

   PDF is a standard for encoding documents in an "as printed" form that is portable between systems. However, the suitability of a PDF file for archival preservation depends on options chosen when the PDF is created: most notably, whether to embed the necessary fonts for rendering the document; whether to use encryption; and whether to preserve additional information from the original document ...

6. Data Secure by AOL - AOL Help

   help.aol.com/articles/data-secure-by-aol

   Encrypt the data you send: Private Wifi uses premium-level security to encrypt everything you send and receive on your computer or mobile device over public WiFi. Real-time data protection: DataMask by AOL creates a secure browsing experience by using anti-keylogging and anti-phishing software that helps protect you from internet threats and ...

7. Xpdf - Wikipedia

   en.wikipedia.org/wiki/Xpdf

   Xpdf can decode LZW and read encrypted PDFs. The official version obeys the DRM restrictions of PDF files, [7] which can prevent copying, printing, or converting some PDF files. [4] There are patches that make Xpdf ignore these DRM restrictions; [8] the Debian distribution, for example, has these patches in place by default. [9]