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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...

Daniel
Sep 16, 2010 1 min read

Asking how to compare PDF files is a frequent question on the PDF forums. It is important to understand what you are trying to...

Mark Stephens
Sep 15, 2010 1 min read

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...

Mark Stephens
Sep 13, 2010 1 min read

10th February 2022 – We have added a new article on the free RUPS viewer, which may be more relevant now. Read our updated...

Mark Stephens
Sep 9, 2010 1 min read

This is part of a series on How to make your own PDF files. This series of articles is part of my learning experience...

Daniel
Sep 8, 2010 2 min read

Because it turned out that people wanted to make PDF files accessible and extract content from PDF documents (and not just view them), Adobe...

Mark Stephens
Sep 7, 2010 51 sec read