Key part is this wrapper:

community License

Use Doors for free in open-source and AGPL-compliant projects.

Price

Free

What you get

Free use under AGPL-3.0-only.

Who it is for

Teams and individuals building software that can comply with AGPL-3.0-only.

What it covers

You can use Doors in development and production under the AGPL.
  • Open-source projects
  • Other AGPL-compliant use
  • Local, staging, preview, and production environments

What it does not cover

Not for closed-source or other non-AGPL use.