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Secure document access system
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Digital recording protection system
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Smart card chaining in pay television systems
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Voice activated communication system and program guide
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Theft prevention system and method
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Smart card chaining in pay television systems
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Methods and systems for non-program applications for subscriber television
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Secure remote access systems
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Catv transmission systems
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Secure access systems
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Apparatus and method for securing communication systems
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Integrated telephone and cable communication networks
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Subscription television program guide
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Integrated telephone and cable communication networks
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CATV systems
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Methods and systems for providing additional service applications in pay television
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File-secure computer system
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System for controlling access to broadcast transmissions
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