Abstract:
A new copy protection signal includes resistance to certain circumvention devices and includes improved playability. The new copy protection signal causes the certain circumvention devices to pass substantially the copy protection effects to a video recorder or to allow for content control effectiveness on a compliant device. The new copy protection signal also causes the circumvention device to add or enhance copy protection effectiveness, which is contrary to the circumvention device's original intent of removing or reducing copy protection effectiveness. The new copy protection signal is provided by inserting or adding one or more pseudo sync pulses or one or more pseudo sync/AGC pulse pairs immediately after, or one line after, a vertical sync signal in at least one television line.
Abstract:
Chroma copy protection signals are provided or synthesized for component or composite video signals by modifying one or more luminance copy protection signal. The system takes advantage of the characteristics of component video signals, wherein the luminance signal (channel) generally is subject to automatic gain control while the chrominance signal (channel) is decoupled from the luminance signal hi automatic gain control (AGC) systems of a video recorder. Accordingly, when a copy protection signal is applied to the luminance signal but does not affect the chrominance signal, a video recorder will output a signal with an attenuated luminance signal and a full amplitude chrominance signal. This causes erroneous color saturation effects. An alternative embodiment provides method and apparatus for reducing or defeating chroma copy protection effects such as disclosed herein.
Abstract:
Method and apparatus for ensuring the security of configuration or programming data supplied to an electronic device, such as a video consumer electronic device. This is achieved by storing within an integrated circuit video processor in the device both logic and data for checking the security of input configuration and/or programming data for the video processor to detect and prevent tampering with same. Not only is it determined if the input data is correct versus unacceptable, also if it is determined unacceptable, the logic then determines if the input data is the result of an innocent error or tampering by a hacker and takes appropriate protective steps accordingly.
Abstract:
The "color stripe" process is well known in the video field for preventing copying by analog video tape recorders of video content, and operates by altering the phase of a portion of the video signal color burst. Here, a weakened version of the color stripe process is employed in a video signal whereby the color burst phase alterations are reduced or attenuated so there is no copy prevention effect on a typical video tape recorder. However the weakened color stripe process is still sufficient to be detectable by a suitable detector located in a compliant device, so the detected presence of the color stripe serves as an encoded indication of copy control or other content control for the video signal by the compliant device.