The present invention provides a data hiding method of hiding media data in message data and a data extraction method of extracting the hidden data wherein message data is dispersively hidden in media data such as an image or sound to prevent a third person from modifying the message data easily....http://www.google.com.au/patents/US6055321?utm_source=gb-gplus-sharePatent US6055321 - System and method for hiding and extracting message data in multimedia data
System and method for hiding and extracting message data in multimedia data
