A copy management system, comprising: a storage media; a terminal device for a user; a management server device; and a storage means; wherein the storage media is stored with predetermined content encrypted with a first encryption key (Content-key) attached with unique media identification information, and distributed from an administrator side to a user; the terminal device comprises a first storage device and copy means for copying the predetermined content stored in the storage media to the first storage device; the terminal device transmits to the management server device predetermined and unique device identification information attached to the terminal device together with the media identification information; the management server device transmits the first encryption key and a second encryption key (Content-Gen-Key) corresponding to the media identification information to the terminal device corresponding to the device identification information when receiving the media identification information and the device identification information; the terminal device receives the first and second encryption keys from the management server device; the terminal device decrypts the content stored in the storage media with the received first encryption key, encrypts the decrypted content with the received second encryption key, copies the encrypted content to the first storage device by the copy means, and stores the second received encryption key to the storage means when copying the content; the terminal device deletes the first encryption key after copying the content; and the terminal device decrypts the content copied to the first storage device with the second encryption key stored in the storage means and reproduces the decrypted content when reproducing the copied content. a storage media; a terminal device for a user; a management server device; and a storage means; wherein the storage media is stored with predetermined content encrypted with a first encryption key (Content-key) attached with unique media identification information, and distributed from an administrator side to a user; the terminal device comprises a first storage device and copy means for copying the predetermined content stored in the storage media to the first storage device; the terminal device transmits to the management server device predetermined and unique device identification information attached to the terminal device together with the media identification information; the management server device transmits the first encryption key and a second encryption key (Content-Gen-Key) corresponding to the media identification information to the terminal device corresponding to the device identification information when receiving the media identification information and the device identification information; the terminal device receives the first and second encryption keys from the management server device; the terminal device decrypts the content stored in the storage media with the received first encryption key, encrypts the decrypted content with the received second encryption key, copies the encrypted content to the first storage device by the copy means, and stores the second received encryption key to the storage means when copying the content; the terminal device deletes the first encryption key after copying the content; and the terminal device decrypts the content copied to the first storage device with the second encryption key stored in the storage means and reproduces the decrypted content when reproducing the copied content.