Guide 01
Why access controls stop at the screen
Access controls decide who may open a document. They say nothing about what happens once it is open in front of someone entitled to see it.
- A phone can photograph a screen in seconds, without writing a log or breaking a permission.
- The organisation usually learns of it only when the information appears somewhere it should not.
- By then there is rarely any way to establish how it left.
- Treat the open-document moment as part of your threat model, alongside storage, transit and access.