The source code authored by us in this repo is
licensed under the Apache v2. The full core is
open source, but the are some boundary functions
that are difficult to publish in a way we can
maintain them.
That leaves it unclear what is and isn't open-source.The same README refers to a "recommended Docker project". However, that project appears to use the <https://github.com/jgraph/drawio> repository with the unclear licence. (Evidence at <https://github.com/jgraph/docker-drawio/blob/05c4a673d9bd4e272ce9b3ac28e504c705f92456/.github/workflows/docker-image-main.yml#L35> and <https://github.com/jgraph/docker-drawio/blob/05c4a673d9bd4e272ce9b3ac28e504c705f92456/main/Dockerfile#L12>, taken together.)