Add Watermark to PDF

Hi There, I can see that your plugin utilizes the Mozilla PDF.js library and I was hoping you could assist me with a small customization I was wanting to do with your plugin which would also benefit other users as well I am sure. Basically I want to add a watermark to the embedded pdf when printing the file.

I found this post on github https://github.com/mozilla/pdf.js/issues/6911

it seems that it is a viable funciton within the PDF.js library and even provides a sample of the code to add however I was wondering if you would be able to assist in where to add this item as the pdf.js library you have added seems to be a slight variant to that which is on github.

Thanks for your itme nad I will be awaiting your reply.