1. Copy Generation Management System - Analog Brian Markwalter Director of Engineering Consumer Electronics Association

2. CGMS-A History Initially introduced as an international standard for conveying copy protection states over an analog video interface through vertical blanking interval data Standardized in IEC 61880 for 525i (480i) as VBI data on line 20 Also specified on line 41 for 520p in IEC 61880-2, and in EIA-J (without bit meanings)

3. CGMS-A in US Standards Standardized in EIA/CEA-608-B for 525i (480i) on line 21. Standardized for component video interface through EIA/CEA-805: –Line 41, 480p –Line 24, 720p –Line 19, 1080i

4. CGMS-A in EIA-608-B Contained in 7 bit field Two bits (b4, b3) are CGMS-A Two bits (b2, b1) are Analog Protection System (APS) bits One bit (b0) is Analog Source Bit (ASB), signals source is pre-recorded material Others reserved

5. CGMS-A Bits in EIA 608 CGMS-A bits Meaning 0, 0 Copying is permitted without restriction 0, 1 Condition not to be used (“No more copies” in EIA-805) 1, 0 One generation of copies may be made 1, 1 No copying is permitted

6. Where CGMS-A Is Used Required by DVD CCA license for certain applications Some DVD recorders respond to CGMS-A on analog inputs D-VHS recorders respond to CGMS-A on analog inputs

7. CGMS-A Attributes A mature technology already implemented on a voluntary basis in many CE devices Requires minimal signal processing Operates in-the-clear Leverages VBI capability and protection

8. Brian Markwalter CEA 703-907-7441 bmarkwalter@ce.org