Data hidden in a plurality of contents is protected from illegal access by a third party. An embedding process is performed by using a frame pattern (mark) that is composed of multiple embedded block patterns comprising several different types and wherein the embedding process is varied in accordance...http://www.google.es/patents/US6370272?utm_source=gb-gplus-sharePatente US6370272 - Multiple frame data hiding method and data detection method
Multiple frame data hiding method and data detection method
