Patent ID: 8724023

Claim:
A method for transporting ancillary data in an active area of a video stream, comprising: at a playback server coupled by a local video link to a projector, receiving an incoming stream of encrypted video image pixel data for projection by the projector; at the playback server, decrypting and decompressing the encrypted data, resulting in unencrypted video image pixel data; at the playback server, re-encrypting the unencrypted data into an outgoing stream of re-encrypted video image pixel data using a first random number generator and an encryption key, including formatting information on the encryption key into a same format as the re-encrypted video image pixel data; transmitting the outgoing stream of video image pixel data including the same formatted encryption key information over the local video link to the projector; and at the projector, extracting the encryption key from the encryption key information from the received outgoing stream, and decrypting the re-encrypted video image data from the received outgoing stream using a second random number generator and the encryption key, resulting in the unencrypted video image pixel data; wherein the encryption key information is formatted as RGB video image pixel data of a DVI local video link.