The twin stars around which digital cinema revolves are quality and security. The first allows some leniency; for example, 3D cinema movie quality is only close to the specification required of 2D movies. But security is meant to be multi-layered and well beyond 'good enough'. From lens to lens, the expectation is that each player will do their part to contribute to a secure whole.
Fortunately, such security is part of a general industry effort that constantly looks for and responds to problems. Unfortunately, there is a lot of nuance that require a professional eye to spot trends. In a field full of artists on very tight schedules and increasingly tight budgets, the art of security can take a lower priority if the ramifications are not known.