Portable Document Format (PDF) is a file format used to present documents in a manner independent of application software, hardware, and operating systems.
PDF File Format
What makes writing a PDF parser especially interesting (ie complex) is that the specification is often ambiguous and that PDF is a very complex... I was visiting a client (RandomHouse) yesterday and it struck me that PDF is actually very commonly used inhouse to provide other products and services.... People sometimes try to edit a PDF file by opening the file in a text editor. This very rarely works for 3 reasons. Firstly,... What is an OCR PDF file? Some PDF files are generated from scanning in pages as images, and these have their own unique quirks.... One of the really cool features about PDF files is that they are not a boring, static file format – they can interact with... 
