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2. 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 ...

3. PDF - Wikipedia

   en.wikipedia.org/wiki/PDF

   Portable Document Format (PDF), standardized as ISO 32000, is a file format developed by Adobe in 1992 to present documents, including text formatting and images, in a manner independent of application software, hardware, and operating systems.

4. History of PDF - Wikipedia

   en.wikipedia.org/wiki/History_of_PDF

   It is intended for the developer of software that creates PDF files (conforming writers), software that reads existing PDF files and interprets their contents for display and interaction (conforming readers) and PDF products that read and/or write PDF files for a variety of other purposes (conforming products).

5. Document file format - Wikipedia

   en.wikipedia.org/wiki/Document_file_format

   PDF — Open standard for document exchange. ISO standards include PDF/X (eXchange), PDF/A (Archive), PDF/E (Engineering), ISO 32000 (PDF), PDF/UA (Accessibility) and PDF/VT (Variable data and transactional printing). PDF is readable on almost every platform with free or open source readers. Open source PDF creators are also available ...

6. Comparison of e-book formats - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_e-book_formats

   Mac OS X has built-in PDF support, both for creation as part of the printing system and for display using the built-in Preview application. Older PDF files are supported by almost all modern e-book readers, tablets and smartphones. Newer PDF files may not display properly on older e-readers, may not open, or may crash them.

7. 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.