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It wouldn't prevent dnna from continuing to use it in other projects.

That's not the issue. The problem is that making an open source branch would mean releasing huge portions of their IP. It's all commercially viable technology still. If all of the car player code was no longer used in any current and future products then maybe.

It all depends on the corporate policy I guess. Some companies are trying the open source model and earning money by selling a complete package or support.

Releasing just the car player specific parts wouldn't be any use either as the core would have to be rewritten. Might as well start from scratch at that point.