Digital work protection system, record/playback device, recording medium device, and model change device

• Main Authors: MATSUI SHINICHI, NOGUCHI NAOHIKO, MIYAZAKI MASAYA, INOUE SHINJI, MATSUZAKI NATSUME, HARADA SHUNJI
• Format: Patent
• Language: English
• Published: 06.04.2010
• Subjects: CALCULATING; COMPUTING; COUNTING; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRIC DIGITAL DATA PROCESSING; ELECTRICITY; INFORMATION STORAGE; INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER; PHYSICS; PICTORIAL COMMUNICATION, e.g. TELEVISION; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION; WIRELESS COMMUNICATIONS NETWORKS

A system includes of a main device and a recording medium device. The main device includes a reception unit that receives a digital work from an external distribution server, an internal storage area for storing the digital work, a playback unit that plays back the digital work, and a unique information storage area for storing information that is unique to the main device. The main device also includes an encryption unit that encrypts the digital work using the unique information, a decryption unit that decrypts, using the unique information, the encrypted digital work having been read from the recording medium device, a write unit that writes the encrypted digital work into the recording medium device which is portable, and a read unit that reads the encrypted digital work from the recording medium device.