Slice mask and moat pattern partial encryption

Details Slice mask and moat pattern partial encryption Slice mask and moat pattern partial encryption

H - Electricity

04

N

H04N 21/4405 (2011.01) H04L 9/28 (2006.01) H04N 21/433 (2011.01) H04N 21/434 (2011.01)

Patent

CA 2748417

A selective encryption encoder consistent with certain embodiments of the invention has vertical and/or horizontal stripes encrypted. In one embodiment, packets are examined in the digital video signal to identify a specified packet type, the specified packet type being both packets carrying intra-coded data representing a pattern of horizontal stripes across an image and packets carrying intra- coded data representing a pattern of vertical stripes across an image. The packets identified as being of the specified packet type are encrypted using a first encryption method to produce first encrypted packets. These first encrypted packets are then used to replace the unencrypted packets in the digital video signal to produce a partially encrypted video signal. The packets of the specified type can also be multiple encrypted and replaced in the data stream to produce a multiple encrypted video data stream.

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