PDF Watermark for printing only, programatically.

Question

Hi there folks,

I'm stuck with the following problem:

I can watermark any PDF already, and the images inside, everything ok, but now I need the watermark only showing up when the PDF is printed... Is this possible? How?

I need to do this programmatically of course...

I'm really stuck and running out of time, any help will be highly appreciated.

Thanks!

Answer 1

You should probably make use of the fact that the screen uses RGB and the printer CMYK. You should be able to create two colors in CMYK that map to the same RGB value. This is of course not enough against a determined specialist.