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They can acquire the team that's primarily building it. If they stay on board and they keep focused on docker CLI, then that's effectively the acquisition of an open source project

And they can take the copyright and the brand and the domain name and ....

Open source != no owner.

Moby is open source; I'm not so sure about Docker Engine and Docker CLI.

Docker CLI is open-source - https://github.com/docker/cli Docker Engine is open-sourced in its community edition - https://github.com/docker/docker-ce