About PDF File

What is PDF? Portable Document Format (PDF) is an open standard for permanent document creation. In 1993, this file format was created by Adobe Systems to represent documents in a manner independent of application software, hardware, and operating systems. Each PDF file contains a complete description of a fixed-layout document, including the text content, fonts styles, graphics, and other information needed to display it.

While the PDF specification has been available free of charge since at least 2001, PDF was originally a proprietary format controlled by Adobe. It was officially released as an open standard on July 1, 2008, and published by the International Organization for Standardization as ISO 32000-1:2008. In 2008, Adobe published a Public Patent License to ISO 32000-1 granting a royalty-free rights for all patents owned by Adobe that are necessary to make, use, sell and distribute PDF file compliant implementations