py-fakePDFtk
A tool to add watermarks to a PDF file - similar to PDFtk
Once installed using pip, a command line script fakepdftk will be provided that allows one to combine a watermark PDF file with another PDF one.
fakepdftk [-h] --background BACKGROUND --output OUTPUT pdfin
For compatibility with existing PDFtk users, "background" and "output" can be used without hyphens