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2. 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.

3. History of PDF - Wikipedia

   en.wikipedia.org/wiki/History_of_PDF

   The Portable Document Format (PDF) was created by Adobe Systems, introduced at the Windows and OS/2 Conference in January 1993 and remained a proprietary format until it was released as an open standard in 2008. Since then, it has been under the control of an International Organization for Standardization (ISO) committee of industry experts.

4. List of file signatures - Wikipedia

   en.wikipedia.org/wiki/List_of_file_signatures

   List of file signatures. This is a list of file signatures, data used to identify or verify the content of a file. Such signatures are also known as magic numbers or Magic Bytes. Many file formats are not intended to be read as text. If such a file is accidentally viewed as a text file, its contents will be unintelligible.

5. Tech tip: How to digitally sign a document on a PC, Mac ... - AOL

   www.aol.com/news/tech-tip-digitally-sign...

   Now you can skip the drive or wait for something to arrive in the mail and sign a document digitally instead. Tech tip: How to digitally sign a document on a PC, Mac, Android, or iPhone Skip to ...

6. PDF/A - Wikipedia

   en.wikipedia.org/wiki/PDF/A

   PDF/A is an ISO-standardized version of the Portable Document Format (PDF) specialized for use in the archiving and long-term preservation of electronic documents.PDF/A differs from PDF by prohibiting features unsuitable for long-term archiving, such as font linking (as opposed to font embedding) and encryption.

7. Adobe Acrobat - Wikipedia

   en.wikipedia.org/wiki/Adobe_Acrobat

   Acrobat Pro is the professional full version of Acrobat developed by Adobe Inc. to edit, create, manipulate, print and manage files in the Portable Document Format (PDF). It is currently available for Windows and macOS users only. Acrobat Reader is the freeware version of Acrobat developed by Adobe Inc. to view, create, fill, print and format ...