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hello everyone and welcome to the talk breaking the specification pdf certification my name is simon and this was a joint work with vladislav christian and york we are all researchers at whole university boho in the next 50 minutes we talk about pdf certification and how to use features and certification to change the content in a certified document we start with the basics and take a look on the pdf structure incremental updates talk about the differences between site and certified documents and take a look on the permission levels in certified documents so on the right side you see a simple pdf document and each pdf document start with the header so the header defines a pdf version the header is followed by the body and contains objects of the pdf document with unique object numbers so it starts with the object of type catalog which reference to the pages object and the pages object reference to all pages in the document as you can see theres only one page in the document so we only