PDF file format is one of the most popular document standards which is widely used, especially in distributing read-only literature. Adobe Systems created this format which stands for Portable Document Format back in 1993. This layout is nowadays an open standard and not dependent of the operating system, hardware or the particular software which created it.
Back in 1993 files with extension pdf could only be edited or viewed by Adobe software and was very limited in use. It could not include hyperlinks for example and since file size is bigger when compared to a plain text document, it resulted in longer download times especially during these years when internet connection was really slow and computers much less powerful.
Patents
Adobe's original software was named Acrobat Reader, but has since then been renamed to Adobe Reader. This software is now also available free of charge and can be downloaded safely from various sources over the internet. Moreover anyone is allowed to develop new software that uses this file format and therefore use a file extension pdf name. Abode still holds patents to PDF, but if a software company wants to comply with its set of specifications, they license the patents royalty-free.
A PDF data file is made up of objects. These objects can be of eight different types are stipulated by Adobe. They can consist of strings, values of Boolean nature, names, numbers, arrays, streams, dictionaries and null. There are two different layouts to this file format. They can either be linear and non-linear. The non-linear ones occupy a smaller storage space, but loading time is bit longer. A linear PDF file is web optimized.
File Extension PDF
Read more about file extension PDF on File-Extension.com. Besides information about PDF, you can try out Uniblue's software utilities to fix Windows registry file association issues.
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