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PDF's adoption in the early days of the format's history was slow. In those early years before the rise of the World Wide Web and HTML documents, PDF was popular mainly in desktop publishing workflows. It was among a number of competing formats such as DjVu (still developing), Envoy, Common Ground Digital Paper, Farallon Replica and even Adobe's own PostScript format (.ps). PDF was developed in the early 1990s as a way to share documents, including text formatting and inline images, among computer users of disparate platforms who may not have access to mutually-compatible application software.

10 Other applications and functionalities.

3.4 Logical structure and accessibility.

3.3.2 Adobe XML Forms Architecture (XFA).

3.2.3.2 Standard Type 1 Fonts (Standard 14 Fonts).

In 2008, Adobe published a Public Patent License to ISO 32000-1 granting royalty-free rights for all patents owned by Adobe that are necessary to make, use, sell and distribute PDF compliant implementations. While Adobe Systems made the PDF specification available free of charge in 1993, PDF remained a proprietary format, controlled by Adobe, until 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 1991, Adobe Systems co-founder John Warnock outlined a system called "Camelot" that evolved into PDF.

Each PDF file encapsulates a complete description of a fixed-layout flat document, including the text, fonts, graphics, and other information needed to display it. Portable Document Format ( PDF) is a file format used to represent documents in a manner independent of application software, hardware, and operating systems. Application/pdf application/x-pdf application/x-bzpdf application/x-gzpdf