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Adobe watermarks using C# & DLL

I've managed to automate the watermarking of PDF documents i.e in c# i've hooked into an the adobe dll, and calling an Adobe menu action that applies a specific watermark to all pages. The code and automation of watermarking works well, but the watermarking only works if the PC its running on is not locked or in sceen saver mode. It seems the PDF has to be active (not necessarily focused) to apply the watermark.

Also the watermark cannot be applied as a background process. Does anyone know a way of applying PDF watermarks even if the PC is locked/screen saver running etc or know any background methods?

Many thanks
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Seven0fNine
Asked:
Seven0fNine
1 Solution
 
Karl Heinz KremerCommented:
Using the Acrobat API is basically remote controlling Acrobat. The EULA you've accepted when you installed Acrobat does not permit the use of Acrobat on a server or in a server-like environment. Running it in the background would certainly qualify as a server-like environment.

As you've noticed, in addition to legal restrictions, there are also technical limitations as to what you can do with the Acrobat API.

This means that Acrobat is not an option for you. I would look into 3rd party PDF libraries and frameworks. For C#, I would very likely use ABCPDF (http://www.websupergoo.com/abcpdf-1.htm). My second choice would be the .NET version of  iText (http://itextpdf.com)

With these libraries, you can create any type of application, and you are not limited to the Acrobat EULA.
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