| 摘要 |
A system for assuring the location integrity of a decryption chip used to receive and decrypt encrypted signals ES received from an encrypted signal source. The decryption chip operates in association with a licensed signal receiver and is licensed for use at a selected site or location Li and is positioned adjacent to a Satellite Positioning System (SATPS) antenna and receiver/processor that determine the present location L of this antenna. If the SATPS-determined location L is within a region R(Li;di), centered at the location Li and having a selected diameter di, and if the signal ES is associated with a channel that is authorized for reception by this signal receiver, the decryption chip is enabled, and the signal ES is decrypted for audible or visual display on the signal receiver. Otherwise, the decryption chip does not decrypt the incoming signal ES. The licensed site location Li can be changed and the group of channels for which signal receipt and decryption is authorized can be changed. This system can operate on encrypted television signals and other similar signals. The SATPS may be a Global Positioning System (GPS) or a Global Orbiting Navigational Satellite System (GLONASS), or another suitable satellite-based location determination system.
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