Copy Protection And Regional Code Management Block - LG GWA-4164B Service Manual

2. Copy Protection and Regional Code Management Block

Block Diagram
MN103SA6G
KEY Management Control
Brief Process
1. Regional Code for DVD Disc
– DVD-ROM drive transfers the regional code of the control data to host by the command of host, the DVD
player of host reads the regional code, and plays title in the case of allowed regional code only.
2. Management of DVD Disc for the scrambled of data
(1) DVD-ROM and DVD player of host generate the "KEY 1" respectively, transfer to opposite part, the
"KEY 2" is received, recognizes the data transfer or not with this value, and generates the bus key
encoded the data.
(2) Encoded "Disc Key" and "Title Key" host is transfer with the bus Key.
(3) DVD player of host reads the key value, and uses the value to restore the scrambled data.
* Refer to the next page for the details.
46
Change the "KEY"
Scrambled MPEG Data
HOST DVD
PLAYER
(EMPEG2 B/D)