Copy protection for digital motion picture image data

Details Copy protection for digital motion picture image data Copy protection for digital motion picture image data

H - Electricity

04

N

H04N 5/913 (2006.01) G02B 27/18 (2006.01) G06T 1/00 (2006.01) H04N 5/74 (2006.01) H04N 9/31 (2006.01)

Patent

CA 2368396

An apparatus and method for displaying a copy-deterrent pattern (104) within a digital motion picture in order to discourage recording of the motion picture using a video camera or other sampling recording device. A copy-deterrent pattern (104) could be, for example, one or more symbols, a random pattern, a digital watermark or a text message (106). The copy-deterrent pattern (104) comprises a plurality of pixels within each frame of the digital motion picture, and the displayed pixel intensities are modulated at a temporal frequency using modulation characteristics deliberately selected to be imperceptible to human observers while simultaneously producing objectionable aliasing in any copy made using a video camera.

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