1. Mar. 24. 2004RTLAB KNU1 DTCP (Digital Transmission Content Protection) Real Time Systems Lab. KNU Myung Jin, Lee Hitachi, Ltd. Intel Corporation MEI (Matsushita Electric Industrial, Co., Ltd.) Sony Corporation Toshiba Corporation

2. Mar. 24. 2004RTLAB KNU2 Digital Content Protection Chain 5C DTCP (Digital Transmission Content Protection) Copy Protection Layer (IEEE1394 Content Protection Architecture) Typical Components of a Compliant Device Content Protection Process Revocation Process DTLA (Digital Transmission Licensing Administrator) Agenda

3. Mar. 24. 2004RTLAB KNU3 Digital Content Protection Chain Ex.1 Contents 공중파 Cable Sattelite Internet Etc. Set-top Box DVD Etc. Contents 인증 - 올바른 Packager - 올바른 Content 안전한 전달 -CAS (Conditional Access System) 장치의 인증 -Compliant Device -Authenticated Channel 안전한 전달 - Secure Channel

4. Mar. 24. 2004RTLAB KNU4 Digital Content Protection Chain Ex.2 Internet DVD-based Recorder/Player Protected TransmissionConditional Access Set-top Box Protected Transmission Internet Conditional Access Protected DistributionProtected Storage Pre-packaged Media Recordable Media Flash Cable Satellite IEEE 1394 USB DVI IEEE 1394

5. Mar. 24. 2004RTLAB KNU5 CPTWG (Copy Protection Technical Working Group) 참고 ) * 5C: Hitachi, Intel, MEI, SONY, Toshiba ** : ① Galaxy Group (Hitachi/IBM/NEC/SONY/Toshiba) ② Millenium Group (Digimac/Macrovision/Philips) CPTWG DTDG DHSG APS Mt. Fuji Group CSS Entity - VGA/RGB Output - Chairman: Macrovision - DVD-R, DVD-RW, ASMO, PCR(DVD+RW 의 Commend/Mode Set - Chairman : Pioneer/HP ‘98.7 - CSS Licensing - Chairman: MEI Chairman : Toshiba 약 26 개 업체참여 DTLA Licensing Authority 설립 (Intel 주도 ) ‘97.5.6 - Watermark Discussion -Chairman: Universal Studio Apple/MEI ‘96.10 - IEEE 1394 Secure Bus - Chairman : Sony/Intel - 5 C* Proposals 채택 CPAC WaRP - ‘99 년 초에 결성 - 최종 2 개의 Proposal ** 심의 중 최종결정기관 CONSENSUS 제안 AH9-1 AH9-2 DVD Forum WG9 CEMA/MPAA/ITA/RIAA/BSA

6. Mar. 24. 2004RTLAB KNU6 Participants : Hitachi, Intel, MEI, Sony, Toshiba Protecting audio/video entertainment content from illegal copying, intercepting and tampering as it traverse high performance digital buses, such as the IEEE 1394 standard. Based on well known cryptographic algorithms and techniques Suitable for implementation on PCs and CE (Consumer Electric) devices Copy Protection Layer Copy Control Information (CCI) Device Authentication and Key Exchange (AKE) Content Encryption System Renewability (5C) DTCP

7. Mar. 24. 2004RTLAB KNU7 Copy Control Information (CCI) Specifies the conditions under which copyrighted content can be copied Embedded CCI is carried in content Encryption Mode Indicator (EMI) provides a protected yet easy to detect mechanism for identifying copy protection status of content - Enables format independent bit stream recorders Copy Protection Layer (Cont’)

8. Mar. 24. 2004RTLAB KNU8 Authentication and Key Exchange Full Authentication - Support all types of content - Must be used for copy-never content - Signed exchange of device certificates, random challenges, and cipher key components - Unique secret key and device certificated issued by DTLA for each device Restricted Authentication - Copy-one-generation, no-more-copies content - Shared secrets, hash function, challenge-and-response protocol - Relatively unique secret keys and unique device certificate issued to DTLA for each device Three Encryption Keys - Authentication Key : to encrypt the exchange key - Exchange Key : to encrypt content key - Content Key : to encrypt the content being exchanged [ Block Cipher ] M6 (Hitachi), Modified Blowfish, DES (Data Encryption Standard) Copy Protection Layer (Cont’)

9. Mar. 24. 2004RTLAB KNU9 Content Encryption Content is encrypted by DTCP source devices prior to output 56 bit M6 block cipher selected as the base line cipher to ensure compatibility Other ciphers can also be supported on an optional basis Copy Protection Layer (Cont’)

10. Mar. 24. 2004RTLAB KNU10 System Renewability Full Authentication available devices Renewability capabilities enhance long term integrity of system through device revocation Updating a Device’s SRM (System Renewability Message) from - Another Compliant Device - Prerecorded Content Media - Real-time Content Source : Networked device, etc. General Procedure for updating SRMs - Examine the version number of the new SRM - Verify that the SRM version number is greater than the one stored in non-volatile storage - Verity integrity with the DTLA public key - If SRM is valid and new, then store SRMs in the device’s non-volatile storage Copy Protection Layer

11. Mar. 24. 2004RTLAB KNU11 Typical Components of a Compliance Device Content Source Destination Storage Authentication and Key Exchange Subsystem System Renewal Subsystem* Content Cipher Subsystem IEEE 1394 Interface Copyright Status & SRMs Content Key Content Algorithm Selection AKE Protocol & SRMs Encrypted Content Un-Encrypted Content IEEE 1394 Bus *Not required by device that only support restricted authentication

12. Mar. 24. 2004RTLAB KNU12 Content Protection Process

13. Mar. 24. 2004RTLAB KNU13 Revocation Process Step 1. STB receives Ver3 of SRM with Device 123 on CRL (Certificate Revocation List) Step 2. STB passes SRM Ver3 to DTV when Cable movie is watched Step 3. DTV passes SRM Ver3 to DVD player when DVD movie is watched Step 4. Device 123 is fully revoked in home environment

14. Mar. 24. 2004RTLAB KNU14 DTLA (Digital Transmission Licensing Administrator) 5C 가 Licensing 업무를 위해 설립 (Intel 주도 ) 계약 대상은 AKE Protocol 을 적용하기 위한 Key 값을 License 함

15. Mar. 24. 2004RTLAB KNU15 CPAC : Content Protection Advisory Counsel MPAA : Motion Picture Association of America CEMA : Consumer Electronics Manufacturers Association ITA : Information Technology Industries Association RIAA : Record Industry Association of America BSA : Business Software Alliance APS : Analog Protection Subgroup SDMI : Secure Digital Music Initiative DHSG : Data Hiding Sub Group WaRP : Watermak Review Panel DTDG : Digital Transmission Discussion Group DTLA : Digital Transmission License Administration CSS : Content Scramble System Appendix A. CPTWG 관련 기관 / 그룹 약자

16. Mar. 24. 2004RTLAB KNU16 Digital Transmission Content Protection Spec. Vol 1. Rev 1.3 5C Digital Transmission Content Protection White Paper Digital Transmission Content Protection -Bill Pearson, Intel Corp. 저작권 보호 기술 표준화 동향 - 차건업, LG 전자기술원 Reference