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Mediaguard is a conditional access system for digital television developed by SECA (Société Européenne de Contrôle d'Accès), company renamed to Canal+ Technologies SA (CEO François CARAYOL), a subsidiary of Canal+ Group, sold to Thomson (CEO Thierry Breton).
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Then Canal+ Technologies SA was broken in two pieces by Thomson in 2003, the Mediaguard sold to Nagra France and the MediaHighway to NDS France.
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Manufacturers which incorporate Mediaguard into their equipment are notably Hitachi, Ltd., Humax, JVC, Kenwood Electronics, Nokia, Pace Micro Technology, Philips, Pioneer Corporation, Sagem, Samsung Electronics, Sony Corporation, Strong, Thomson, and Toshiba