Canary Trap - Embedding Information

Embedding Information

The technique of embedding significant information in a hidden form in a medium has been used in many ways, which are usually classified according to intent:

• Watermarks are used to show that items are authentic and not forged.
• Steganography is used to hide a secret message in an apparently innocuous message, in order to escape detection.
• A canary trap hides information in a document that uniquely identifies it, so that copies of it can be traced.
• Screener versions of DVDs are often marked in some way so as to allow the tracking of unauthorised releases to their source.