A copyright information management system supporting the management and protection of products comprised of digitalized multimedia content in a product distribution environment. The copyright information management system (10) provides a copyright information management center (11), provided in a product distribution environment (15) where products are distributed through communications lines (14) between a product provider (12) including at least one of a copyright owner and distributor and a product user (13) receiving the product, for exchanging information relating to the products through the communications lines (14). The copyright information management center (11) centrally manages all copyright information through the communications lines (14) by preregistering copyright information relating to the individual products in the center (11).