As far as I know, it is all patents. Here is another source, as linked in my above post:
https://www.wired.com/2014/06/tesla-just-gave-all-its-patent...
https://www.wired.com/2014/06/tesla-just-gave-all-its-patent...
> Tesla CEO Elon Musk announced today that his company will not "initiate patent lawsuits against anyone who, in good faith, wants to use our technology."
The question really is - what defines "good faith" for Musk and Tesla.
Additionally, I am no patent expert but it will be interesting to see licensing terms, if any. Specially after what happened with React and Facebook.
That post suggests no company legal team would allow it. The article thinks Apple might use it, as an example of a user.
I am no expert, so I'll defer to others.