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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

   HTML 4.01 Specification since PDF 1.5; HTML 2.0 since 1.2 Forms Data Format (FDF) based on PDF, uses the same syntax and has essentially the same file structure, but is much simpler than PDF since the body of an FDF document consists of only one required object. Forms Data Format is defined in the PDF specification (since PDF 1.2).

4. Poppler (software) - Wikipedia

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

   By the version 0.18 release in 2011, the poppler library represented a complete implementation of ISO 32000-1, [3] the PDF format standard, and was the first major free PDF library to support its forms (only Acroforms but not full XFA forms) [5] [6] and annotations features.

5. Extensible Metadata Platform - Wikipedia

   en.wikipedia.org/wiki/Extensible_Metadata_Platform

   CC PDF Converter - A free open source (GPL) program to convert documents to PDF with embedded Creative-Commons license (Microsoft Windows). darktable - RAW developer, can read/write XMP in supported file formats (Linux, Mac OS X, Microsoft Windows, BSD)

6. PDF/UA - Wikipedia

   en.wikipedia.org/wiki/PDF/UA

   PDF/UA (PDF/Universal Accessibility), [1] formally ISO 14289, is an International Organization for Standardization (ISO) standard for accessible PDF technology. A technical specification intended for developers implementing PDF writing and processing software, PDF/UA provides definitive terms and requirements for accessibility in PDF documents and applications. [2]

7. List of file signatures - Wikipedia

   en.wikipedia.org/wiki/List_of_file_signatures

   In the table below, the column "ISO 8859-1" shows how the file signature appears when interpreted as text in the common ISO 8859-1 encoding, with unprintable characters represented as the control code abbreviation or symbol, or codepage 1252 character where available, or a box otherwise. In some cases the space character is shown as ␠.