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2. History of PDF - Wikipedia

   en.wikipedia.org/wiki/History_of_PDF

   The specifications for PDF are backward inclusive. The PDF 1.7 specification includes all of the functionality previously documented in the Adobe PDF Specifications for versions 1.0 through 1.6. Where Adobe removed certain features of PDF from their standard, they are not contained in ISO 32000-1 [9] either. Some features are marked as deprecated.

3. PDF - Wikipedia

   en.wikipedia.org/wiki/PDF

   In December 2020, the second edition of PDF 2.0, ISO 32000-2:2020, was published, with clarifications, corrections, and critical updates to normative references [16] (ISO 32000-2 does not include any proprietary technologies as normative references). [17] In April 2023 the PDF Association made ISO 32000-2 available for download free of charge. [15]

4. 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

5. Adobe Acrobat version history - Wikipedia

   en.wikipedia.org/wiki/Adobe_Acrobat_version_history

   Adobe Acrobat 9.0 was released. Support for version 9 ended June 26, 2013, [10] with the last available update being 9.5.5. Adobe Acrobat 9.5.5 is the very last version, which can be installed on Unix-based system. Therefore 10 years after release Adobe Acrobat 9.5.5 is still used on modern and cutting-edge Systems. [11] [12] [13]

6. Geospatial PDF - Wikipedia

   en.wikipedia.org/wiki/Geospatial_PDF

   The PDF format is widely accepted and is considered the de facto standard for printable documents on the web. This means that users do not require the any proprietary plug-in to read geospatial PDFs created following the PDF 1.7 specification, which was published as ISO 32000-1 standard . [ 3 ]

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 ...