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Main article: PDF was developed in the early 1990s as a way to share computer documents, including text formatting and inline images. It was among a number of competing formats such as,, Common Ground Digital Paper, Farallon Replica and even 's own format. In those early years before the rise of the and documents, PDF was popular mainly in. Adobe Systems made the PDF specification available free of charge in 1993. PDF was a controlled by Adobe, until it was officially released as an on July 1, 2008, and published by the as ISO 32000-1:2008, at which time control of the specification passed to an ISO Committee of volunteer industry experts.

In 2008, Adobe published a Public Patent License to ISO 32000-1 granting rights for all patents owned by Adobe that are necessary to make, use, sell, and distribute PDF compliant implementations. PDF 1.7 includes some proprietary technologies defined only by Adobe, such as (XFA) and extension for Acrobat, which are referenced by ISO 32000-1 as and indispensable for the application of the ISO 32000-1 specification. These proprietary technologies are not standardized and their specification is published only on Adobe’s website. Many of them are also not supported by popular third-party implementations of PDF. On July 28, 2017, ISO 32000-2 was published by the ISO.

ISO 32000-2 does not include any proprietary technologies as normative references. Technical foundations [ ] The PDF combines three technologies: • A subset of the page description programming language, for generating the layout and graphics.

• A /replacement system to allow fonts to travel with the documents. • A structured storage system to bundle these elements and any associated content into a single file, with where appropriate. PostScript [ ] is a run in an to generate an image, a process requiring many resources. It can handle graphics and standard features of such as if and loop commands.

PDF is largely based on PostScript but simplified to remove flow control features like these, while graphics commands such as lineto remain. Often, the PostScript-like PDF code is generated from a source PostScript file. The graphics commands that are output by the PostScript code are collected and. Any files, graphics, or fonts to which the document refers also are collected. Then, everything is compressed to a single file. Therefore, the entire PostScript world (fonts, layout, measurements) remains intact. Vhr Stock Car Setups For Project.