Axiom Secure Digital (SD) card is designed specifically for the distribution of copyrighted digital information, including audio, images and video. Security for the SD card is based on the 4C Content Protection for Recordable Media (CPRM) standard used widely in the consumer electronics industry. Reading and writing (in protected areas) is permitted by the SD card's control circuitry when appropriate external devices are detected. The SD card is compact; it is about the size of a postage stamp. The SD card memory storage is based on the proven flash technology. As a result, the card is rugged and reliable, because it retains information without any power, and there is no moving part to break down.
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