Shopify App for Marking Digital PDFs with Buyer’s Name/Email to Prevent Piracy?

Hi all, I'm looking to sell PDFs in the education space and would like to limit students sharing the product to whatever extent I can, so I'm looking for a Shopify plugin that will let me mark it with the downloader's name, email, and includes a tracking code.

I have personally downloaded files from Shopify companies using this add in before, and the add in puts "Prepared exclusively for PERSON'S NAME, EMAIL, Tracking code: 111111111" at the bottom of every page.

Anyone know the plugin I'm looking for?

Best, Daniel