# US 5,621,793 A · TV set top box using GPS > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,621,793 A - Document ID: US5621793A - Status: Granted - Kind: A - Application number: 08/437,424 - Filed: 1995-05-05 - Granted: 1997-04-15 - Earliest claimed: 1995-05-05 - Assignees: Rubin, Bednarek & Associates, Inc. - Inventors: Robert A. Bednarek; Philip A. Rubin - Web page: https://patentgrep.com/patent/US5621793A ## CPC - H04N 7/1675: {Providing digital key or authorisation information for generation or regeneration of the scrambling sequence (pseudo-random number generators in general G06F7/58)} - G01S 19/14: specially adapted for specific applications - G01S 19/36: relating to the receiver frond end - G01S 19/42: Determining position - H04N 7/163: {by receiver means only} - H04N 21/42202: {environmental sensors, e.g. for detecting temperature, luminosity, pressure, earthquakes} - H04N 21/4405: involving video stream decryption - H04N 21/4424: {Monitoring of the internal components or processes of the client device, e.g. CPU or memory load, processing speed, timer, counter or percentage of the hard disk space used (error monitoring in general G06F11/30; arrangements for monitoring conditions of receiving stations in broadcast systems H04H60/32; diagnosis, testing or measuring for television receivers H04N17/04)} - H04N 21/4524: {involving the geographical location of the client (retrieval from the Internet by querying based on geographical locations G06F16/9537; systems specially adapted for using geographical information in broadcast systems H04H60/70; protocols in which the network application is adapted for the location of the user terminal in communication control or processing H04L67/52; services making use of the location of users or terminals in wireless networks H04W4/02; locating users or terminals in wireless networks H04W64/00)} - H04N 21/4627: Rights management {associated to the content (security in data switching network management H04L41/28; security management or policies for network security H04L63/20; access security in wireless networks H04W12/08)} - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION - G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES ## Abstract An integrated receiver decoder (IRD), commonly called a set-top box, has a global positioning system (GPS) receiver. The GPS receiver checks to see if the IRD is at an authorized location and allows descrambling of video signals only if the location is authorized. A central access control system, remote from the customers/viewers, has a high quality GPS receiver and sends some GPS data in the transmission medium used to send video signals to the customers. This GPS data, referred to herein as indirect GPS data, is used by the IRD such that it requires less complexity than otherwise. The IRD introduces a pseudo-random time delay in generating certain signals such that spoofing (i.e., providing phony signals to the IRD) is much more difficult. Various components of the IRD are in a common sealed container such as an integrated circuit or a smart card such that tampering with the components and spoofing are more difficult. ## Claims ### Claim 1 A video signal access control system comprising a customer access control operable at a customer location and having: a signal input to receive at least one video signal from a remote source; a video signal processor operably connected to receive video signals from the signal input; a conditional accesser operably connected to the video signal processor; a signal output operably connected to the video signal processor and providing a useable video output signal only upon the conditional accesser authorizing access to one or more video signals from the remote source; and a GPS signal receiver operable at the customer location to receive position information from remote sources and operably connected to the conditional accesser, the conditional accesser authorizing access only if the GPS signal receiver receives signals consistent with the customer access control being at an authorized location. ### Claim 2 (depends on 1) The video signal access control system of claim 1 wherein the conditional accesser authorizes access only if the GPS signal receiver receives signals consistent with the customer access control being at a single fixed location authorized for service. ### Claim 3 (depends on 2) The video signal access control system of claim 2 wherein conditional accesser authorizes access using criteria to test for authorization in addition to information about the location of the customer access control. ### Claim 4 (depends on 3) The video signal access control system of claim 3 wherein the customer access control is a non-transmitting unit. ### Claim 5 (depends on 2) The video signal access control system of claim 2 wherein customer access control uses the GPS receiver and conditional accesser to make range verifications consistent with the customer access control being at a single fixed location authorized for service and without the customer access control determining the location of the customer access control. ### Claim 6 (depends on 2) The video signal access control system of claim 2 wherein the customer access control uses the GPS receiver to determine the location of the customer access control and wherein the conditional accesser authorizes access only if the determined location is at the single fixed location authorized for service. ### Claim 7 (depends on 1) The video signal access control system of claim 1 wherein the customer access control is a non-transmitting unit. ### Claim 8 (depends on 1) The video signal access control system of claim 1 wherein customer access control uses the GPS receiver and conditional accesser to make range verifications consistent with the customer access control being at a single fixed location authorized for service and without the customer access control determining the location of the customer access control. ### Claim 9 (depends on 8) The video signal access control system of claim 8 wherein the GPS receiver of the customer access control is a single channel receiver. ### Claim 10 (depends on 1) The video signal access control system of claim 1 wherein the customer access control uses the GPS receiver to determine the location of the customer access control and wherein the conditional accesser authorizes access only if the determined location is at the single fixed location authorized for service. ### Claim 11 (depends on 1) The video signal access control system of claim 1 wherein the customer access control further includes a GPS processor operably connected to receive direct GPS information from the GPS receiver and a decoder operably connected to the signal input to provide indirect GPS signals received from a transmission medium carrying the at least one video signal from a remote source; and wherein the GPS processor uses information from the indirect GPS signals to determine which GPS sources are to be used by the customer access control and the location of the determined GPS sources. ### Claim 12 (depends on 11) The video signal access control system of claim 11 further comprising a central access control remote from customers and having: a source of at least one video signal; an output device for placing video signals from the source onto a transmission medium for transmission to customers with the customer access control; a central GPS receiver operable to receive position information from remote sources and operably connected to apply data messages to the output device, the data messages corresponding to the position information and the output device supplying the position information to the transmission medium for transmission to customers. ### Claim 13 (depends on 1) The video signal access control system of claim 1 wherein the customer access control further includes a GPS processor operably connected to receive direct GPS information from the GPS receiver and wherein the conditional accesser requests measurements from the GPS processor at measurement start times which are at least pseudo-random. ### Claim 14 (depends on 13) The video signal access control system of claim 13 wherein the customer access control has the GPS processor and conditional accesser within a common sealed container selected from the group consisting of: an integrated circuit and a smart card; and wherein the common sealed contained has within it a code generator operable to generate a code for selecting a GPS source from which data is to be obtained. ### Claim 15 (depends on 1) The video signal access control system of claim 1 further comprising a central access control remote from customers and having: a source of at least one video signal; an output device for placing video signals from the source onto a transmission medium for transmission to customers, the video signals sent to customers being unusable without a key. ### Claim 16 (depends on 15) The video signal access control system of claim 15 wherein the central access control further includes: a central GPS receiver operable to receive position information from remote sources and operably connected to apply data messages to the output device, the data messages corresponding to the position information and the output device supplying the position information to the transmission medium for transmission to customers. ### Claim 17 A video signal access control system comprising a customer access control operable at a customer location and having: a signal input to receive at least one video signal; a video signal processor operably connected to receive video signals from the signal input; a conditional accesser operably connected to the video signal processor; a signal output operably connected to the video signal processor and providing a useable video output signal only upon the conditional accesser authorizing access to one or more video signals from the remote source; and a GPS signal receiver operable at the customer location to receive position information from remote sources and operably connected to the conditional accesser, the conditional accesser authorizing access only if the GPS signal receiver receives signals indicating that the customer access control is at an authorized location; and wherein the conditional accesser authorizes access only if the GPS signal receiver receives signals consistent with the customer access control being at a single fixed location authorized for service. ### Claim 18 (depends on 17) The video signal access control system of claim 17 wherein customer access control uses the GPS receiver and conditional accesser to make range verifications consistent with the customer access control being at a single fixed location authorized for service and without the customer access control determining the location of the customer access control. ### Claim 19 (depends on 17) The video signal access control system of claim 17 wherein the GPS receiver of the customer access control is a single channel receiver. ### Claim 20 (depends on 17) The video signal access control system of claim 17 wherein the customer access control uses the GPS receiver to determine the location of the customer access control and wherein the conditional accesser authorizes access only if the determined location is at the single fixed location authorized for service. ### Claim 21 (depends on 17) The video signal access control system of claim 17 wherein the customer access control further includes a GPS processor operably connected to receive direct GPS information from the GPS receiver and a decoder operably connected to the signal input to provide indirect GPS signals received from a transmission medium carrying the at least one video signal from a remote source; and wherein the GPS processor uses information from the indirect GPS signals to determine which GPS sources are to be used by the customer access control and the location of the determined GPS sources. ### Claim 22 A video signal access control system comprising a customer access control operable at a customer location and having: a signal input to receive at least one video signal; a video signal processor operably connected to receive video signals from the signal input; a conditional accesser operably connected to the video signal processor; a signal output operably connected to the video signal processor and providing a useable video output signal only upon the conditional accesser authorizing access to one or more video signals from the remote source; and a GPS signal receiver operable at the customer location to receive position information from remote sources and operably connected to the conditional accesser, the conditional accesser authorizing access only if the GPS signal receiver receives signals indicating that the customer access control is at an authorized location; and wherein the conditional accesser uses criteria to test for authorization in addition to information about the location of the customer access control. ### Claim 23 (depends on 22) The video signal access control system of claim 22 wherein the conditional accesser authorizes access only if the GPS signal receiver receives signals consistent with the customer access control being at a single fixed location authorized for service. ### Claim 24 (depends on 22) The video signal access control system of claim 22 wherein the customer access control uses the GPS receiver and conditional accesser to make range verifications consistent with the customer access control being at a single fixed location authorized for service and without the customer access control determining the location of the customer access control. ### Claim 25 (depends on 24) The video signal access control system of claim 24 wherein the GPS receiver of the customer access control is a single channel receiver and wherein the customer access control is a non-transmitting unit. ### Claim 26 (depends on 22) The video signal access control system of claim 22 wherein the customer access control uses the GPS receiver to determine the location of the customer access control and wherein the conditional accesser authorizes access only if the determined location is at the single fixed location authorized for service. ### Claim 27 (depends on 22) The video signal access control system of claim 22 wherein the customer access control further includes a GPS processor operably connected to receive direct GPS information from the GPS receiver and a decoder operably connected to the signal input to provide indirect GPS signals received from a transmission medium carrying the at least one video signal from a remote source; and wherein the GPS processor uses information from the indirect GPS signals to determine which GPS sources are to be used by the customer access control and the location of the determined GPS sources. ### Claim 28 (depends on 22) The video signal access control system of claim 22 wherein the customer access control further includes a GPS processor operably connected to receive direct GPS information from the GPS receiver and wherein the conditional accesser requests measurements from the GPS processor at measurement start times which are at least pseudo-random and wherein the customer access control has the GPS processor and conditional accesser within a common sealed container selected from the group consisting of: an integrated circuit and a smart card; and wherein the common sealed contained has within it a code generator operable to generate a code for selecting a GPS source from which data is to be obtained. ### Claim 29 A video signal access control system comprising a customer access control operable at a customer location and having: a signal input to receive at least one video signal; a video signal processor operably connected to receive video signals from the signal input; a conditional accesser operably connected to the video signal processor; a signal output operably connected to the video signal processor and providing a useable video output signal only upon the conditional accesser authorizing access to one or more video signals from the remote source; and a GPS signal receiver operable at the customer location to receive position information from remote sources and operably connected to the conditional accesser, the conditional accesser authorizing access only if the GPS signal receiver receives signals indicating that the customer access control is at an authorized location; and wherein the customer access control is a non-transmitting unit. ### Claim 30 (depends on 29) The video signal access control system of claim 29 wherein the conditional accesser authorizes access only if the GPS signal receiver receives signals consistent with the customer access control being at a single fixed location authorized for service. ### Claim 31 (depends on 29) The video signal access control system of claim 29 wherein the customer access control uses the GPS receiver and conditional accesser to make range verifications consistent with the customer access control being at a single fixed location authorized for service and without the customer access control determining the location of the customer access control. ### Claim 32 (depends on 29) The video signal access control system of claim 29 wherein the GPS receiver of the customer access control is a single channel receiver. ### Claim 33 (depends on 29) The video signal access control system of claim 29 wherein the customer access control uses the GPS receiver to determine the location of the customer access control and wherein the conditional accesser authorizes access only if the determined location is at the single fixed location authorized for service. ### Claim 34 (depends on 29) The video signal access control system of claim 29 wherein the customer access control further includes a GPS processor operably connected to receive direct GPS information from the GPS receiver and a decoder operably connected to the signal input to provide indirect GPS signals received from a transmission medium carrying the at least one video signal from a remote source; and wherein the GPS processor uses information from the indirect GPS signals to determine which GPS sources are to be used by the customer access control and the location of the determined GPS sources. ### Claim 35 (depends on 29) The video signal access control system of claim 29 wherein the customer access control further includes a GPS processor operably connected to receive direct GPS information from the GPS receiver and wherein the conditional accesser requests measurements from the GPS processor at measurement start times which are at least pseudo-random and wherein the customer access control has the GPS processor and conditional accesser within a common sealed container selected from the group consisting of: an integrated circuit and a smart card; and wherein the common sealed contained has within it a code generator operable to generate a code for selecting a GPS source from which data is to be obtained. ### Claim 36 A video signal access control system comprising a central access control remote from customers and having: a source of at least one video signal; an output device for placing video signals from the source onto a transmission medium for transmission to customers; a central GPS receiver operable to directly receive position information from remote GPS sources, the remote sources being remote from both the central access control and the customers, and operably connected to apply data messages to the output device, the data messages corresponding to the position information and the output device supplying the position information to the transmission medium for transmission to customers. ### Claim 37 (depends on 36) The video signal access control system of claim 36 wherein the central access control further comprises a central conditional access operably connected to the GPS receiver/processor and the output device to provide a scrambling key to the output device for scrambling video signals prior to placement on the transmission medium. ### Claim 38 (depends on 37) The video signal access control system of claim 37 wherein the central conditional access encrypts the position information supplied to the output device. ### Claim 39 (depends on 37) The video signal access control system of claim 37 further comprising a customer access control having: a signal input to receive at least one video signal from a remote source; a video signal processor operably connected to receive video signals from the signal input; a conditional accesser operably connected to the video signal processor; a signal output operably connected to the video signal processor and providing a useable video output signal only upon the conditional accesser authorizing access to one or more video signals from the remote source; and a GPS signal receiver operable to receive position information from remote sources and operably connected to the conditional accesser, the conditional accesser authorizing access only if the GPS signal receiver receives signals consistent with the customer access control being at an authorized location.