Patent ID: 6845450

Claim:
A display circuit for use in a display unit, said display circuit comprising: a non-volatile memory storing a encrypted key, wherein said encrypted key is generated from an unencrypted key according to an encryption protocol; and an integrated circuit coupled to said non-volatile memory, said integrated circuit receiving said key in encrypted form and decrypting said key to generate a decrypted key, said integrated circuit using said decrypted key wherein said integrated circuit comprises a key encryption circuit receiving said unencrypted key, said key encryption circuit generating said encrypted key form said unencrypted key according to said encryption protocol, a key decryption circuit receiving said encrypted key and generating said decrypted key according to said encryption protocol, a receiver adapted for receiving a plurality of digital data elements encoded in a display signal, wherein said digital data elements represent a plurality of pixel data elements in an encrypted form, said plurality of pixel data elements representing an image, and a data decryption circuit receiving said plurality of digital data elements and generating said plurality of pixel data elements, wherein said image is generated on a display screen based on said plurality of pixel data elements, and wherein said display signal is received according to TMDS format.