Apple’s campus is, according to the article, “a maze of security doors” where employees must swipe their badges and enter codes on numeric keypads — presumably not only to restrict access, but to serve as a record of who was where if any information does leak out. Many work areas are monitored by closed-circuit TV. According to one unnamed employee, “workers in the most critical product-testing rooms must cover up devices with black cloaks when they are working on them, and turn on a red warning light when devices are unmasked so that everyone knows to be extra-careful.”