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AssigneeRovi Solutions Corporation
InventorRonald Quan
Estimating the term…
A modified Colorstripe™ copy protection process utilizes a basic anti-copy protection (ACP) signal that causes attenuation of a video signal, wherein, in one embodiment, the process modifies (lowers) the level of a front porch portion and adds an incorrect color signal (color burst) in the region of the sync tip. When an illegal copy is made, a pre-blanked end of line portion causes a TV set to trigger the color burst sample pulse ahead of time and cause the incorrect color signal in the sync tip region to be sampled. Thus, since the sync tip region has incorrect color phase or frequency, the resulting illegal copy will have enhanced color distortions. In other embodiments, other portions of the horizontal blanking interval are lowered in level and incorrect color bursts are added to a portion or portions of the back porch and/or a portion of the front porch. A further embodiment employs lowering a back porch portion above a sync tip level near the beginning of a video line to form a pseudo sync/AGC pulse pair. The various embodiments of the process may include an adaptable process, as well as several alternative ACP signals for use in combination with the process.
A method of synthesizing at least a part of a copy protection signal in a video signal wherein the video signal includes video lines, horizontal blanking intervals, given levels of front porch and back porch, horizontal sync, and a color burst area, comprising:
Apparatus for providing a modified video signal of a video signal, for inhibiting video recording of an illegal copy, wherein the video signal includes video lines having sync pulses and horizontal blanking intervals, comprising:
Apparatus for providing a modified analog video signal from an Internet transmission of a video signal, comprising:
Apparatus for providing a modified analog video signal from an Internet transmission of a video signal, comprising:
Dependencies are inferred from the claim text.