The license works the same as any other license you probably have for fonts, images, sounds, etc. For example, if you load a web font in an app, you most likely have a single use license, but thousands of users may use the font when they use the app. They don't however have a right to use that font in other applications.

This is similar. However, I'm going to work on wording that makes the concerned users more comfortable. I understand that this is a tricky situation. And I'm much more interested design then legal matters. I hope I can ease the concerns.