Your copy of the Ultimate Envelopes Sheet includes the Apps Script source code that powers it.

You can: freely use and modify that code in your own copy of the Sheet, for your own personal, household, or business budgeting.

You can’t: distribute the code — modified or unmodified — to anyone else. If you’d like to share Ultimate Envelopes with someone, please point them to ultimateenvelopes.com so they get their own copy.

This is a plain-language summary — the Terms of Service has the full license language you agree to by using the Sheet.