This is the best summary I could come up with:

Before last week, owners of certain Mazda vehicles who also had a Home Assistant setup could create some handy connections for their car.

In a Digital Millennium Copyright Act (DMCA) notice sent to GitHub, Mazda (or an authorized agent) alleges that Rothweiler's integration:

Frequent Home Assistant contributor J. Nick Kolston, or bdraco on GitHub, was the first of many commenters confused by Mazda's code claims.

Reverse-engineering for interoperability, such as exposing the Mazda app's particulars to Home Assistant, could be considered a fair use exception to the DMCA, as explained by the EFF.

Integrations involving other car brands, including Subaru, the Nissan Leaf, and Tesla's Wall Connector, are still present.

"We genuinely believe there is a common ground between us and Mazda when it comes to enabling the owners of their cars to explore the possibilities of their own data," Home Assistant founder Paulus Schoutsen wrote.

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