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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...
