Label a photo

The labels, the time and your name are burned into the picture itself, so they survive WhatsApp, a download and a screenshot. Photos are kept inside the app and cannot be saved to your device — the only way to send one out is the share button. Nothing is stored in your phone's memory, and every photo is deleted from the server after 2 days, so send anything you need to keep before then. Because your name and contact are printed on every copy, a photo that leaks is traceable to whoever took it.