Semnote uses dual licensing.
Source code
The source code is licensed under AGPL-3.0-or-later. That keeps improvements to networked derivatives in the commons instead of turning the hosted version into a private fork.
Content and documentation
Content and documentation are licensed under CC BY-NC-SA 4.0. That fits written material better than software licensing alone.
Embedded code snippets
Code snippets inside documentation are dual-licensed so they can be reused in either software or documentation contexts without ambiguity.
Warranty
Semnote is distributed without warranty. The scaffold keeps that explicit rather than burying it in a footer.