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2. PDF - Wikipedia

   en.wikipedia.org/wiki/PDF

   For example, Adobe Systems grants permissions to enable additional features in Adobe Reader, using public-key cryptography. Adobe Reader verifies that the signature uses a certificate from an Adobe-authorized certificate authority. Any PDF application can use this same mechanism for its own purposes.

3. PAdES - Wikipedia

   en.wikipedia.org/wiki/PAdES

   PAdES has 4 levels of verification for digital certificate, from the most simple and basic (b-b, indicating a signature was executed with a certificate that was valid on a date) to the most complex (b-LTV) allowing electronically signed documents to remain valid for long periods (long term validity) even if underlying cryptographic algorithms ...

4. Adobe Acrobat - Wikipedia

   en.wikipedia.org/wiki/Adobe_Acrobat

   Acrobat Messenger is a document utility for Acrobat users that was released by Adobe Systems in 2000 to convert paper documents into PDF files that can be e-mailed, faxed, or shared online. Acrobat Reader Touch is a free PDF document viewer developed and released on December 11, 2012, by Adobe Systems for the Windows Touch user interface.

5. Skim (software) - Wikipedia

   en.wikipedia.org/wiki/Skim_(software)

   skim-app .sourceforge .io. Skim is an open-source PDF reader. It is notably the first free software PDF reader for macOS. [2] It is written in Objective-C, and uses Cocoa APIs. It is released under a BSD license. It is also cited as being able to help annotate and read scientific papers. [3]

6. 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. PagePlus: Proprietary: No

7. Adobe Acrobat version history - Wikipedia

   en.wikipedia.org/wiki/Adobe_Acrobat_version_history

   Adobe Reader is now Adobe Acrobat DC. Version 15.0.0 was released on April 7, 2015, supporting iOS 8.0 and above. The new features include: Easily accomplish frequent tasks from the new Tools menu; View recent files across computers and devices with Mobile Link; Use free Adobe Fill & Sign to fill, sign, and send forms on your iPad