Open-source software
TarifDelta V0 uses SheetJS Community Edition to read and write spreadsheet files.
SheetJS Community Edition — Official SheetJS website
Copyright © 2012-present SheetJS LLC
Apache 2.0 License.
Version 0.20.3 of the script is bundled with TarifDelta and served from the same hosting. No external CDN is contacted. Selected files are read locally by the browser and are not uploaded by TarifDelta to a server.