Invented by Adobe Systems over 20 years ago, the Portable Document Format (PDF) is now an open standard for electronic document exchange maintained by the International Organization for Standardization (ISO). When you convert documents, forms, graphics, and web pages to PDF, they look just like they would if printed.
PDF
From a practical point of view you need one of two sort of files in order to sign something. Either a keystore file or... Asking how to compare PDF files is a frequent question on the PDF forums. It is important to understand what you are trying to... PDFObject streams are a very useful feature added to the PDF specification from version 1.6 which introduces a new type of PDF object. Until... 10th February 2022 – We have added a new article on the free RUPS viewer, which may be more relevant now. Read our updated... This is part of a series on How to make your own PDF files. This series of articles is part of my learning experience... 
