I have a great many pdf document to add a header to. Aspose seems the ideal product to accomplish this monumental task. I downloaded the trial, got the 30 day license, installed it, wrot a console app in C# to recure thru a directory structure of PDFs. I seems to be working when all the pages in a document are in portait mode. Some of the pages in the documents are rotated 90 degrees clokwise and for these it dose not process them at all. Is there something esle I need to do rotated pages? Also, does there have to be a certain amount of space for the header of a page to be modified and if there is not, is there a way to detect the header size?