If an employee of a company makes a promise to you that that employee does not have authority to make, that company is not bound by that promise. The fact that you were acting in good faith and really thought you had a valid promise does help you legally, but only until the company brings the true state of affairs to your attention.
A license is, of course, a kind of promise. (But don't worry about the case discussed here. It is water under the drawbridge and was peacefully resolved a long time ago.)