A protected memory circuit for use with an electronic data system includes a memory element such as a shift register, and memory control or lock means to selectively control {HEAD ~ enablement} of {TAIL ~ the memory element} for read/write operations 
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A protected memory circuit for use with an electronic data system includes a memory element such as a shift register , and memory control or lock means to selectively control { HEAD ~ enablement } of { TAIL ~ the memory element } for read / write operations
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