anything that is on your computer, you must be able to save.
- Does Ctrl-S (File > Save) work? (unlikely). Can you select all and copy/paste?
- Try the browser extension SingleFile https://github.com/gildas-lormeau/SingleFile
- Since you already have your "license", find a PDF backup online. https://annas-archive.org, PDFdrive.com, libgen (websearch for current URL), sci-hub (same), archive.org (need DeDRM from github to download adobe ebooks permenently)
- as someone else suggested, ask some pirates: https://lemmy.dbzer0.com/
- Maybe it would be easier to remove the email address from the background. How to do that depends on what sort of fuckery is going on in the PDF and how nerdy you are. Can you open it in any editing software?