Let’s say you need to send a private message to a group of people, but you’re afraid one of them will leak the message elsewhere, and you won’t know who. Fast Forward Labs has a rough-and-ready solution that will expose anyone who publicly copies and pastes your message, without letting them know they’ve been caught.
from Lifehacker http://ift.tt/2sN6w2Y
http://ift.tt/2rXFiDU