Fun fact: there is also no express patent license in GPLv2. There have been lawsuits on that. I know because I was the lawyer who filed one of them. So...yeah, this problem is not hypothetical.

You should hire lawyers to improve your contracts before the ambiguity in your old ones cause lawsuits.

That said, “Blue Oak” is a terrible name and will cause even more hassle than “Apache” when dealing with non-technical folks.

Explaining to the CFO that we license <component> to customers under “Apache” terms to avoid internal legal issues for our customers is... hard.