[nunobrito]

Yes, it seems we need some kind of designation like copyleft for the context of patents or maybe already exists one.

Quid pro quo is well adjusted for the context.

[shkkmo]

A copy left style arrangement would require you to not enforce your patents against anyone who signs and upholds the agreement, not just with Tesla. If that was the case, I probably wouldn't have quibbled with the term "open source" being applied.