1. A Trusted Key Management Scheme for Digital Rights Management ETRI Journal, Volume 27, Number 1,February 2005 Yeonjeong Jeong, Kisiong Yoon, and Jaecheol Ryou

2. Outline  Introduction  DRM system  Trusted Key Management Scheme Encryption Key Key Distribution Scheme Key Delivery Scheme  Conclusion

3. Introduction  Digital rights management adopts a license-based mechanism which separates the keys from encrypted contents.  Digital rights management do not provide a way to protect a digital content form the license server.

4. DRM system

5. Encryption Key  The digital content is encrypted with a symmetric keys.  To protect against the illegal use of symmetric keys, the seeds of symmetric keys are encrypted with a public key.

6. Key Distribution Scheme

7. Key Delivery Scheme Key delivery when packaging

8. Key Delivery Scheme Key delivery when content service is provided

9. Conclusion  The proposed scheme protects the key from not only the purchaser but also other principals.