Open-source licenses
The Envelo app uses two open-source libraries. Their licenses are also included in your download (folder 4 App, file LICENSES.txt).
qrcode-generator 1.4.4
Copyright (c) 2009 Kazuhiko Arase – MIT License. Makes the QR codes for moving your data between devices.
jsQR 1.4.0
By Cosmo Wolfe and contributors – Apache License 2.0. Reads those QR codes with the camera.
The spreadsheets themselves contain no third-party code.
Questions: info@envelosheets.com