If a television program that is otherwise accessible through the viewer's subscription is associated with a category that the subscriber has deemed acceptable for viewing, the subscriber's decoding equipment will decode the corresponding program signal. If the television program is associated with a category that the subscriber has deemed to be unacceptable for viewing, the equipment will not decode the corresponding program signal. The method is particularly useful to parents who wish to restrict the television programs viewed by their children.

The second method resulted from the development of technology for inverting lines or fields of the video signal on some basis that could be reproduced at a subscriber's home. While this technique satisfactorily prevented unauthorized viewing of the signals, viewers found that the reconstituted signal was frequently distorted.


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IPPV also cites the specification, which states "[t]he present invention relates to the encoding and decoding of video information, and more importantly, to a method and system for secure transmission of television signals for subscription television or similar video services in which only authorized viewers are permitted to view a video program." IPPV argues the references to "video" in this passage limit claim 21 to video information.

Echostar further contends that the remainder of the specification and prosecution history are consistent with its proposed construction. Echostar points out that the only forms of scrambling discussed in the specification involve the rearrangement of portions of a television program signal relative to other portions. The inventors stated in the specification that "in accordance with the invention, the normal TV signal is encoded or scrambled such that if the video information contained in the encoded signal were displayed by a standard television receiver without decoding, the resultant picture presented to the viewer would have parts rearranged in sequence relative to their normal positions in the scanning sequence." With regard to the prosecution history, Echostar argues that the inventors limited the meaning of "encrypting" when they distinguished prior art by stating, "[b]oth the system of the Block patent and that of the present invention operate in the same general fashion to encode a television program signal, i.e. by rearranging parts of the signal relative to other parts thereof." 2351a5e196

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