watermark existing pdf with ruby

Question

Is there a way to watermark an existing pdf in ruby ?

I want to add a dynamically generated text,

Thanks,

Answer 1

Use Ruport.

1st result for Googling ruby pdf watermark.

Answer 2

Check out Prawn(http://github.com/sandal/prawn) for just ruby and Prawnto(http://github.com/thorny-sun/prawnto) for Ruby on Rails.

You are probably going to want to either use the image embedding functionality or the background image functionality.

Here's an example of using a background image http://cracklabs.com/prawnto/code/prawn_demos/source/general/background