Unfortunately, it works.

The secrets Apple keeps - Fortune Tech: Apple created an elaborate and unnerving system to enforce internal secrecy. It revolves around the concept of disclosure. To discuss a topic at a meeting, one must be sure everyone in the room is "disclosed" on the topic, meaning they have been made privy to certain secrets. "You can't talk about any secret until you're sure everyone is disclosed on it," said an ex‑employee. As a result, Apple employees and their projects are pieces of a puzzle. The snapshot of the completed puzzle is known only at the highest reaches of the organization.