License
AGPL-3.0 for the code. The name and logo are separate.
What you can do
- Use it for anything, including commercially.
- Read every line. Recommended, for software holding your finances.
- Modify it however you like.
- Redistribute it, including charging money.
- Run it as a service.
The one condition
Share your changes under the same license. Distribute a modified DohFlow and you must offer users the complete corresponding source. Section 13 extends that to network use — run a modified DohFlow as a hosted service and your users are entitled to your modified source, even though you never handed them a binary.
That is the whole deal. Free software includes the freedom to charge; what it does not include is taking the code closed.
Why AGPL rather than MIT
A permissive license would let someone take this, bolt on a closed sync service, and sell it — including back to the people who need it most. The AGPL means anyone competing with a hosted DohFlow has to publish their source the same way. Users keep the freedom to leave.
The name and the logo
Not covered. Fork the code freely — the license guarantees that — and ship your fork under your own name. Describing it as “derived from DohFlow” is fine and welcome. See TRADEMARK.md.