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2. PDF - Wikipedia

   en.wikipedia.org/wiki/PDF

   A PDF file is organized using ASCII characters, except for certain elements that may have binary content. The file starts with a header containing a magic number (as a readable string) and the version of the format, for example %PDF-1.7. The format is a subset of a COS ("Carousel" Object Structure) format. [23]

3. List of PDF software - Wikipedia

   en.wikipedia.org/wiki/List_of_PDF_software

   Full feature PDF editor. Poppler-utils: GNU GPL: Yes Yes Unix Yes Converts PDF to other file format (text, images, html). pstoedit: GNU GPL: Yes Yes Unix Yes Converts PostScript to (other) vector graphics file format. QPDF: Apache License 2.0: Yes Yes Yes Structural, content-preserving transformations from PDF to PDF. Scribus: GNU GPL: Yes Yes Yes

4. 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.

5. PDF/VT - Wikipedia

   en.wikipedia.org/wiki/PDF/VT

   The ubiquity of PDF, as well as the fact that PDF itself now is an ISO standard (ISO 32000-1:2008 [4]) clearly work in favor of PDF/VT. Nevertheless, it is currently difficult to predict where in the industry PDF/VT will be adopted and how fast that will happen, and how it will be positioned vis-à-vis other formats and architectures for ...

6. List of open file formats - Wikipedia

   en.wikipedia.org/wiki/List_of_open_file_formats

   An open file format is a file format for storing digital data, defined by a published specification usually maintained by a standards organization, and which can be used and implemented by anyone. For example, an open format can be implemented by both proprietary and free and open source software , using the typical software licenses used by each.

7. History of PDF - Wikipedia

   en.wikipedia.org/wiki/History_of_PDF

   ISO standards for "full function PDF" [32] are published under the formal number ISO 32000. Full function PDF specification means that it is not only a subset of Adobe PDF specification; in the case of ISO 32000-1 the full function PDF includes everything defined in Adobe's PDF 1.7 specification.