SuperDoc is licensed under AGPL-3.0 or a separate commercial agreement. See LICENSE.

SuperDoc 2 depends on the separately published @superdoc/docx-engine package.
The SuperDoc npm tarball does not contain the engine implementation or its
license files. The exact engine version is declared in package.json.

The engine package carries its own license and notices:
https://docs.superdoc.dev/resources/docx-engine-license