Watermark

Hello,At the moment I am using a few extensions of your firm like Eshop and Eventsbooking. So, I know the quality of the software is good. And from that perspective it is appealing to buy another program for selling ebooks, like Edocman.At the moment I am using Quicksell for that purpose. Main reason for that is that there is a possibility to protect your PDF-files with a watermark (the users emailaddress).Unfortunately this application is updated for the last time two years ago. It doesn't work with PHP 8.0 and is not upgraded to Joomla4. So, it is a matter of time to say goodby.My question: could it be possible to enable this (or another) watermark functionality to Edocman?
Like to hear from you.
Kind regards,Tim Hoogland.

The idea is to protect your ebooks with a watermark of f.i. the name or the emailaddress of the buyer and/or an QR-code.
I also suggested this to Les Arbres Design for their extension Mediashop. In the meantime they added this functionality, so I'm now using Mediashop instead of Quicksell. Nevertheless it would be a nice feature to extend Edocman with.

Kind regards,
Tim Hoogland.