06870930 is referenced by 18 patents and cites 8 patents.

The present invention is directed to systems and methods for protecting digital content during transmission. One version of the invention provides a method for encryption in a high-speed digital video transmission system that includes the steps of: a) performing transition controlled encoding of a first sequence of n bit data words into encoded n+1 bit data characters where the n is a positive integer, b) performing XOR masking of the encoded n+1 bit data characters with an XOR mask to produce masked n+1 bit data characters; c) DC balancing the masked n+1 bit data characters to produce DC balanced, masked n+2 bit data characters; d) scrambling the DC balanced, masked n+2 bit data characters using a scrambling formula to produce encrypted n+2 bit data characters; e) encoding control data into encoded n+2 bit control characters, f) generating a serial data stream in response to the encrypted data characters and encoded control characters, and g) transmitting the serial data stream over a communication link. Subsequent to step (e) and prior to step (f), the method can further include the step of encrypting the encoded n+2 bit control characters, such that the generating step generates a serial data stream in response to the encrypted data characters and the encrypted control characters.

Title
Methods and systems for TMDS encryption
Application Number
9/579811
Publication Number
6870930 (B1)
Application Date
May 26, 2000
Publication Date
March 22, 2005
Inventor
Seung Ho Hwang
Palo Alto
CA, US
Russel A Martin
Menlo Park
CA, US
David D Lee
Palo Alto
CA, US
Bruce Kim
Cupertino
CA, US
Victor M Da Costa
Santa Cruz
CA, US
Gyudong Kim
Sunnyvale
CA, US
Agent
Perkins Coie
Assignee
Silicon Image
CA, US
IPC
H04N 007/167
H04K 001/06
H04L 009/00
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