Adobe's PDF Library is based on C/C++ and licensable for server use. It is a fairly low level API (for instance there is no "add footer" API, because a footer is just text and graphics to be added). It is licensed by DataLogics who add support for additional languages including Java and .NET and additional simplified interfaces. Good knowledge of the PDF specification is, however, a must. http://www.datalogics.com/products/pdf/pdflibrary/
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