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On testing for immutability of codes (Corresp.)

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Immutable codes have the property that information recorded with them on write-once memories such as digital optical discs cannot be changed. Write-once memory permits changing a0into a1, but once a1is written it cannot be changed back into a0. Most commonly used codes do not have the property of immutability. After a very general definition of immutability is given, algorithms which test a given code for immutability are developed. Algorithms are presented for fixed-length codes as well as for variable-length codes.

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Information Theory, IEEE Transactions on  (Volume:33 ,  Issue: 6 )