From John Kapili:
Vanishing Message is a file message that can be sent by email attachment or file transfer. The message can be read by the recipient then vanishes without a trace. As we all know there are times when we need to send a message to someone that we want no trace of later. Vanishing Message uses a random encryption on all words, no word is ever encrypted the same. The message vanishes if exited, cannot be copied, if viewed longer than one minute it vanishes and you can use the same file to forward or email another person a new message.