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2. PDF - Wikipedia

   en.wikipedia.org/wiki/PDF

   Adobe Acrobat is one example of proprietary software that allows the user to annotate, highlight, and add notes to already created PDF files. One UNIX application available as free software (under the GNU General Public License) is PDFedit. The freeware Foxit Reader, available for Microsoft Windows, macOS and Linux, allows annotating documents.

3. PAdES - Wikipedia

   en.wikipedia.org/wiki/PAdES

   the signature verifying algorithm that uses the public key, message and digital signature to confirm the authenticity of the message. For PDF documents, the signature data is incorporated directly within the signed PDF document, much as an ink signature becomes an integral part of a paper document, allowing the complete self-contained PDF file ...

4. Sumatra PDF - Wikipedia

   en.wikipedia.org/wiki/Sumatra_PDF

   Sumatra has a minimalist design, with its simplicity attained at the cost of extensive features. For rendering PDFs, it uses the MuPDF library. [4]Sumatra was designed for portable use, as it consists of one file with no external dependencies, making it usable from an external USB drive, needing no installation. [5]

5. Adobe Acrobat - Wikipedia

   en.wikipedia.org/wiki/Adobe_Acrobat

   Acrobat Pro is the professional full version of Acrobat developed by Adobe to edit, create, manipulate, print and manage files in a PDF. It is currently available for Windows and macOS. Acrobat Reader is the freeware version of Acrobat developed by Adobe to view, create, fill, print and format files in a PDF.

6. Adobe Acrobat version history - Wikipedia

   en.wikipedia.org/wiki/Adobe_Acrobat_version_history

   Originally called Adobe Reader For Windows Tablets (Version 1.0) was released on the Microsoft Windows Store on the second week of December 2012, [38] based on the Adobe Reader Mobile engine found in the iOS, Android, Blackberry and Windows phone versions, is the first application written by Adobe Systems for the Windows 8/RT Metro Style interface.

7. 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 ...