Digital content management system using electronic watermark

摘要: A system for managing a digital content, particularly content to which copyright is claimed, and supplying public-key used in the management of are provided. The program embedded an operating user apparatus as micro- kernel, watch or command linked emitted by using network data broadcasting, thereby, illegitimate usage etched. visible watermark added when illegitimately utilized, restrain later usage. Even regular usage, route copying transferring can also be ascertained adding invisible watermark. Further, put distribution screen distributed broadcasting. Image information on owner electronic watermark, entered screen, so that authenticity checked