It can be done. But several consideration -> watermark only have sense with PDF files ( not all your files might be PDF ), also should be created a new event ( or patch existing code ) to be sure each time you retrieve the content of a document on edition, previouly the document is stamped.
Watermark at downalod for edition is quite strange, for me might be it have more sense when uploading ? also editing PDF file it is something not much confortable.
About OpenKM compilation, I suggest you download OpenKM development environment what comes with everything ready to be used. If you have ever worked with eclipse should be easy to you get OpenKM compiled, really it is ready to check out and build.
apply a stamp/watermark to a given document at each checkout?
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