FizzyTools Protect / Unlock PDF uses these open-source components. Thank you to their authors.

- Svelte (MIT)                       https://github.com/sveltejs/svelte
- @cantoo/pdf-lib (MIT)              https://github.com/cantoo-scribe/pdf-lib
- pdf.js / pdfjs-dist (Apache-2.0)   https://github.com/mozilla/pdf.js
- fflate (MIT)                       https://github.com/101arrowz/fflate
- Bricolage Grotesque, DM Sans (SIL OFL 1.1) /protect-pdf/fonts/