https://mozilla.github.io/pdf.js/
Apache License
https://github.com/rkusa/pdfjs
MIT License
https://github.com/SheetJS/js-xlsx
Microsoft Open Specifications Promise Apache License
https://html2canvas.hertzen.com/
MIT License
http://www.paratype.com/public/
ParaType Free Font License