Overlay between two PDF in C#

See more:

C#

PDF

I'm looking for a way to get the result of an overlay between two pdf documents.

We have a document with a single page and only a header and another document with multiple pages and full content (header and body). We're looking for way to generate an overlay pdf between those documents, so that the resulting document with the content gets its header overwritten in each page with the single page document header. Basically like this:

picture

Is there a opensource c# library, which can handle this while not converting the text to a picture.
I looked at PDFSharp and docnet, but couldn't figure it out with either of them.

So far we are using pdfbox, but we'd like to get rid of the java dependency.

What I have tried:

implementation with docnet and pdfsharp. can't use Itextsharp, since it might be used in a commercial product.