End-User

Movie studios make movies, and then license them to exhibitors, i.e. the theaters. But the End-User is the guy who buys one ticket for the Sunday matinee re-showing of Star Wars in 4D. The movie studio that distributed the film doesn't know who this guy is. Nor does the director who made it. Only the exhibitor knows who their end user is.

And this is a very different kind of E-U than you'll find in prison. You probably want to stay away from those.