Whats the proper way to use a proprietary software license according to ament_copyright?

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Python entrypoints are very low overhead. All the existing licenses are already entrypoints even for the "default" ones. As an example of what it takes to add a license see: https://github.com/ament/ament_lint/p... including registering the entrypoint. That registration can be done from any python package in the workspace.

Extending the package seems like a very good option for this use case, I'll give it a try and report on my findings.

So I just experimented cloning the ament_copyright package to my workspace, added my proprietary license to ament_copyright (on my workspace) as suggested by Tully and it works beautifully. In my opinion this is a great solution for proprietary software.

I believe the idea is to create a new package, host your files in there and then extend ament_copyright by registering an entrypoint with ament_copyright.

That would avoid you having to maintain a fork of the package while still being able to add the custom license check.

Exactly what @gvdhoorn said. You should create your own package and export the entry point for ament_copyright to find. What you did to extend ament_copyright to support your package can be done in any python package you include in your workspace. I'd suggest a dedicated package mycompany_ament_copyright.